03-02-2009, 11:57 AM
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I am pleased to see that you have your betta in a suitable size tank but I am afraid it will not support any more catfish. As mentioned already , catfish(corys0 are social fish that seem to do poorly if not kept in groups of at least four. From your photo, the gravel or substrate, is too rough for corys who much prefer small, fine,smooth gravel or sand. Theyr'e barbels, or whiskers can become damaged and possible infections are not uncommon if substrate is too rough and some substrates,, make it esier for food to fall down into and begin to decay which can lead to water quality problems. Be careful not to feed too much, perform small regular weekly water changes and you will have few problems. I would hold off on anymore catfish and DO try and find the remains of the missing fish for this too can cause water quality problems which in turn, cane result in sick fish. Decaying food or plants or dead fish can cause ammonia spikes which are responsible for many fish deaths in aquariums.