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What species of Bettas are you having? Actually female Bettas are aggressive. They will kill each other and bite each other tails and fins until they die especially if you get the colorful Koi Bettas.

Actually the recommended tank for Discus is 8-10 gallons per fish. You can have about 6 Discus in your 55 gallons. Keeping Discus can be unpredictable. Here are some information from the Discus breeders Jack Wattley and Stendker about the stocking level. But if you can't access the link below...

Where did you find the nests? It's nice to see bird nests and their chicks.

Is the blindness caused by old age or parasite or bacteria infections? Some info here: https://fishcareguide.com/what-is-cloudy-eye-in-fish/ https://cafishvet.com/fish-health-disease/fish-cloudy-eyes/

Is there any escape route like filter intake tube where it can climb up and escape? Or is there any tall driftwoods, plants or deco where is can climb out from the tank? Usually shrimps are not so intelligent like crabs that can escape easily even with lid/cover. I've never seen my Bamboo...

I think not normal. Probably you can stop feeding it for a few days in case of overeating as @NannaLou mentioned.

All these are soft water fish. Please ensure that you have soft tap water and low pH. And as @Byron mentioned, bigger group is better for the Corydoras and even the Ember or Espei if you don't have any other fish. If you can have many tall plants will be good as they will feel more secure.

It can be the crayfish is molting. But it shouldn't take too long. By the way, you have beautiful Guppies. You might want to check your tap water GH, pH. If you don't have the testers, you can check your tap water company website for the water report. Look for the average values within a year...

You mentioned that the Ammonia is 0. What about the Nitrite level? Both need to be 0. As @Naughts and @Essjay mentioned, if you didn't add any ammonia source during the cycling process, the beneficial bacteria couldn't grow. What brand of bacteria did you use? Anyway, assuming that your...

Is your tank fully cycled? Usually it require 1-1.5 month for a tank to be fully cycled unless you use some live bacteria or established filter media or adding some fast growing plants. Shrimps are sensitive to ammonia, nitrite and chemicals. Also, take note that you need to do proper...

The pH difference is big 7 & 8. Your tap water GH & KH at 0 also isn't good. Whenever you change water, you don't want to have a change of more than pH 0.5 in 24 hours. API even suggest not to have more than pH 0.2 change in 24 hours as some fish are sensitive to pH change. If you want to use...

I forgot to ask you. Is the skinny fish eating well? Sometimes due to being bullied by another fish, it may not have much to eat. Also, how long have you been keeping the fish? Most Cichlids are picky eaters. Most of them prefer smaller and softer fish pellets or granules. But sometimes they...

Skinny or sunken belly while the fish is still eating usually means internal worms which can be treated by Flubendazole, Levamisole or Praziquantel. (depending on the types of worm). When you see a fish with big head and a skinny body, it's definitely having internal infection. If it stops...

As @Rocky998 had mentioned, check your water hardness(GH) and pH to find out what fish are suitable for you. If you have hard water and high pH, African fish, live bearers such as Guppies, Platies, Mollies or Rainbow fish are suitable. But if you have soft water and low pH, then you can...

Actually for best size tank, a 6 to 8ft tank with 6 of them. For a 60gallons tank(4ft X 1.5ft), probably you can have 4 of them(my estimation only). For a 75 gallons tank (4ft x 2ft), probably you can have 5 of them.(my estimation only) It's best to start with at least 5-6 of them to spread out...

First two photos are my Sveni. My lighting is quite dim as it's old. I just bought a new tropical red LED which will give nicer colours and enhance their colours during photo taking but I haven't taken any photo with my new LED yet. Btw, I haven't put in all my sand yet as I am still treating...

Becareful of nutrients under gravel. It can "stink" your tank. I once did it for my shrimps tank believing that it will promote micro-organisms growth in my tank. But in the end, I restarted my tank again throwing away all the gravel, washed and rinsed the tank.

Actually tap water is safe for Betta unless your tap water is very hard (high GH). Do you know your spring water and tap water GH and pH? Whenever you change your water source, you don't water to have too drastic change in GH and pH. Also, take note that Betta prefer soft water and lower pH as...

Just make some small cuts at the side of the cover. You can use a mini saw to cut it. Or you can get 1-2 internal filters as others had suggested. Personally, I prefer two filters for backup purposes, for more filter medias and for more effective filtrations since I guess your tank is a 4ft...

How big is your Yoyo loach? And how big is your tank? By right, Yoyo shouldn't be too aggressive.

Your canister filter is a Fluval 407. It can be used for up to a 500 liter tank. I guess you have to turn down the water flow as your tank is 190liter. Check here for more information especially the Fluval website for maintenance and installations tips...

I think for unusual fish, the salt water has many unusual, interesting or even beautiful fish like the Jelly fish, Mandarin fish(Dragonet), Octopus, Stingray(both marine and fresh water), Seahorse, Lionfish, etc. Actually my favourite fish keeps changing. I guess at the moment, my favourite...

Your lighting duration is too long. Reduce it to 7-8 hours per day. How frequent did you change your water and how much water did you change? You should change water once a week with at least 60-70% of water change.

I guess with only one fish in your tank, Fluval 307 is more than enough. But don't you want to add more fish? I saw in one of the aquariums in our river themed zoo, there was a giant Puffer fish with many other fish. The Puffer fish has like golden/yellow colour and the aquarium is about 8-10...

Firstly, it's too early to add new fish after just a few days of fishless cycle. Usually it requires 2-3 weeks of fishless cycle with frequent testing of ammonia, nitrite and nitrate level. Please refer to the attached link below for more information. The beneficial bacteria in your tank is too...

Hi all, I'm planning to use Ista pre-filter with my Fluval 207 for a 30 gallons tank. Has anyone used these two filters together? Will it cause any problem during the start-up? Fluval 207: https://fluvalaquatics.com/us/product/207-performance-canister-filter-up-to-45-us-gal-220-l/ I know it...

Actually using an AC power lighting (fluorescent lamp) on top of your tank pose a risk of electric shock. Today LED lightings are powered by DC low voltage from an enclosed power supply which is very safe. LED lights also save your electric bills as compare to fluorescent lamps, and they are...

I think it's better to leave the one recovering in the quarantine tank in case it still carry the ich parasites. It will spread to the rest if it still carry the ich. It will take longer time to medicate the rest if they are also infected. Continue to medicate the one that is recovering for...

Another nice old song is Forever Young by Alphaville. This song was written in protest against the use of nuclear bomb.

Actually there are too many nice songs since my parents time till now. I have many collections of nice songs from my parents time or my older brother and sisters time. Anyway, one of my favourite is by Enya - May it be. This song was used in the movie Lord of the Rings where most of the shots...

Great and good ending unlike the South Korean ferry captain who abandoned the ferry and responsible for the death of 250 high school students. https://www.google.com/amp/s/www.bbc.com/news/world-asia-32492263.amp

Ich is very contagious. You must not put it in the main tank until you have treated it for 10-14days. Even though the fish is cleared from ich, the ich parasites eggs will still be around and can re-infect the fish again. You will need to treat for another 7-10 days after all the white spots...