Betta with Hole in the Head, and other tank problems for newbs

kidsgotmeintofish

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utah
Hi, new to the forum and fish tanks in general. Long story short, I ended up buying a 20 gallon tank because my daughter was gifted a betta fish and I wanted to do things right. The new tank came with:
sand substrate,
three or four different types of plants, pretty thickly planted
heater that keeps tank at somewhere between 72 and 75 degrees fahrenheit
sponge filter
a light
two bigger snail of an unknown species
lots of smaller snails
three guppies, 2 male 1 female
1 golden cloud minnow I think is what it was called
guy I bought it from said he rarely had to change the water, and would add as needed and it stayed pretty solid.

Took it home, placed betta in it and they all adjusted nicely. little bit of chasing here in there, but I haven't noticed any large issues. I have been doing 30% water changes probably every 3 weeks or so. we usually leave the light on about 10-12 hours a day, and have been feeding twice a day. Guppies and minnow have been eating some flake food, Betta fed with pellets and dried bloodworms, but he also started eating the flakes more so than the pellets. Ive also been checking water quality with test strips and everything has been pretty good. I know our water is pretty high on the basic side but nitrites and ammonia are all okay

so.... fast forward three months
currently the tank is looking really poor and I'm concerned my betta is developing Hole in the head disease.
-one of the plants would grow way too fast and overtake a lot of space. We have trimmed it down as we thought best, but it just made it longer and stringier it seemed like.
-some type of algae has slowly started overtaking a lot of the plants and growing on rocks in substrate and into my sponge filter
-I tried adding four corydoras from a local pet store chain and three of the four died pretty quickly. ( I didn't quarantine them so Im concerned they might have been sick already and thats where the Hole in the Head infection is from)
-Betta has been acting really odd, sitting on bottom or hiding in plants which has not been normal. This seemed to have started shortly after the corydoras were introduced. I noticed this morning some brown lesions on his head that I hadn't seen before.
-small snails are exploding in growth. eating all my plants, making them look horrible

Things I've tried
-I think the algae and the snails are a result of overfeeding, and I was concerned the betta was constipated or bloated from the same issue and that's why he was acting weird. We stopped feeding for a few days and then cut back to once a day and he made a bit of progress as far as not sitting on the bottom, but he still is hiding in plants and hanging below the surface at an angle pointing up. I'm hoping the cutback will reduce algae growth, and I will work on removing snails ( they seem to flock to the cordoryas pellet food making it easier to pick them out)
-cut back the light to 8-9 hours
- I did add 10 ghost shrimp hoping to help cleanup some algae and other nutrients. They seem to be doing great.
-guppies and minnows seems to be fine, heck the female guppie has had a few babies, so they have to be feeling good in my mind


Do I need to do more frequent water changes? Do I need to cut back the amount of fish in the tank? Add CO2 for plants to outcompete algae? antibiotics for the betta? Feed even less? There's just so much info out there that I'm really not sure what the best route is. I want to have a healthy looking tank and keep my fish happy, but it seems I'm slowly losing my tank to a lot of different problems. Any suggestions or advice different from my current changes? Any help is appreciated.



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Can you post some pictures of the betta and also the tank itself? That may help people give more specific advice and guidance. Unfortunately I don't know much about hole in the head so I can't give any advice but others will be able to assist once they see pictures.

I'd say 30% every 3 weeks isn't enough in terms of water changes myself but your stocking isn't heavy. Pictures will be really helpful.

Algae is a symptom of too many nutrients - light, food, waste. You'll need to follow a process of elimination to work out which. Your snail population may indicate it's food as that could also be enabling them to thrive.
 
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The algae is hard to see in the tank picture because I did try and clean it up a little before the post. it is collecting on the rocks, and around the bases of the plants and working its way up. In the picture of the Betta you can see it all stringy all over really close up
 
I know this remark is stupidly out of context.

But I need to say it because it is a pretty Impactful part of an aquarium setup.

I don't know why. But lately, I see Many installations with at least 3 times and more substrate than needed.

This will cause the most unpleasant side effects in the long run. Like they say on the internet... Believe me !...

One twentieth of a tank should be substrate not 20%.

One big part of nutrients control is water changes and not pushing too much food that remains uneaten. If a tank rejects a product, so do I. And the 35$ spent on that food becomes part of "gain and losses". When using flakes with a betta, soak them before until they flow in the water. This prevents bloating on piggy bettas.
 

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