Fish Dying Fast

[sarah220]

3 days ago a neon tetra died, last night a long finned zebra danio died and tofay 3 more neons died. they all had an eye missing and were swimming upside down. i have 1 neon, 1 zebra danio, 1 corydora, 1 pleco, 2 golden barbs and some baby golden barbs left. the temp is 26 degrees celcius, the ph is 7 and the tank size is 60L. none of the fish are new and the babies are about 8 weeks old and in a netted area of the tank. i have seperated all of the fish apart from the babies which i cant catch and changed about 25% of the water. they just keep dying and i dont know why.

 

[tttnjfttt]

Can you please post your ammonia, nitrite, and nitrate levels?

Before your fish lost an eye, did you ever notice the eye swelling or bulging out, kinda like it was popping out of the socket?

 

[Tokis-Phoenix]

I agree with tttnjfttt, you have lost many fish and the first thing you must do is buy some proper test kits from your lfs if you don't already have them for ammonia, nitrates and nitrites and post us your stats, in the mean time i would advise you do a 30% water change with dechlorinator(you do use that don't you?).
What is your tank cleaning regime on average and everything you do?
How many fish have you lost over the last 2months and how long has the tank been set up? What are the symtoms of the fish before they died i.e gasping at the surface, bloated appearance, cloudy eyes or changes in coloration, any growths, flicking and rubbing themselves on objects in the tank etc?