help me my fish are dying!

Amy ferries

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Hi there,
I've had my tank for about 5 months now and nothing has gone wrong up until now. Off hand I think its about 60 litres, maybe a little less and has about 6 plants in it. In it I have 3 black phantom tetras, 3 flame tetras, 7 neons, 4 white cloud minnows, 4 balloon mollies, 1 white molly, 1 dalmation molly, 2 corydoras catfish, 1 algae eater (sorry dont know the technical name, its not a loach though), 2 platies, and 3 golden danios. It all started about a month ago when i lost a full sized male dalmation molly, it was found on the bottom of the tank upside down with no visible symtoms of disease. The only thing I noticed was a slight yellow edge to its top fin, I checked the other white mollie and I noticed they had goldish tint too so I decided to watch for any other symtoms. I began to notice the danios, black phantoms and mollies scratching themselves against the rocks and all the fish started hanging around the surface so I put in some slime/velvet disease tonic, this did not seem to help them hanging around the surface so I took a risk at stressing them and took all the fish out into buckets and did a 50% water change and added an undergravel filter to try and oxygenate the water. This stopped them hanging around the surface and the tonic was added again. (you can repeat it every 48 hours). A couple of days later my white balloon molly was on the bottom and looked as though shed been pecked at. All her fins were torn and her tail was almost none existant, I isolated her in a breeding trap and went to the pet store,they recommended a fin healing tonic and offered to test the water. A 25% water change was completed and then fin clear added, she only lasted another 24 hours and by the time she died her tail and fin had become progressively worse and had reddened. This was a couple of days ago. This morning I woke up to find one of my little algae eaters on the bottom of the tank on its side, with no visable symptoms, I am thinking that it may have starved because of the excessive cleaning earlier in the week when I added the undergravel filter but I'm unsure. After observing them again this morning I noticed scratching again in a couple of mollies and danios, what should I do??
 
Do you have kits to test the levels of ammonia, nitrite and nitrate? It looks like your tank is overcrowded and this usually causes the types of problems that you are having right now. If you do not have these kits you should get them as soon as you can afford to. In the meantime i would be doing 25% water changes daily to see if that helps the situation and also if you could add an airstone or air curtain to get some extra circulation in the tank. HTH :)
 
I have a nitrate testing kit and the results from that are normal, I presume the pet store did the other tests for me when I took in a water sample yesterday, but I will buy them myself when I can afford it. Thanks for your help.
I noticed the catfish, danios and mollies scratching today so shall I put in some velvet treatment or do you think its something else? I dont think its white spot but one thing I have notices is a pale patches on the black balloon molly on one side near its gill and on the other near its tail, could this be fin rot starting? As this may have been what killed the white balloon molly? Keeping fish is so stressful!
 
When you say the nitrate reading is normal what do you mean(actual reading). By the symptoms it sounds like this is a water quality issue and to help we would need the readings. If you cant get the kits right now can you take a sample to the lfs or a friend and get the actual readings for ammonia, nitrite and nitrate, it would help immensely. Again the problems IMO aare related to overcrowding in the tank from what i can quickly calculate you have over 50 inches of fish in a 15 gallon aquarium and it needs to be corrected or these problems will continue. Can you find new homes for some of the fish? If not you will need to do daily water changes as i stated below and you need to get extra air flow into the tank. HTH :)
 

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