i have been having issues with my tiny corydoras. several months ago i bought 6 pygmy cories, and 4 died...over a two week period.
second try, i added three more- and they all slowly died over about two weeks
take three - i just added ONE more...partially because i can't bring myself to keep spending the money only to fail.
i have no idea why they are dying over and over again! here are some of my ideas;
1.) my male cherry barb has been seen harassing them from time to time, maybe stressing them out to death? (for some reason, he never bothers the first two pygmys i put in)
2.) difficulty feeding them correctly, possibly not feeding enough
3.) maybe not enough of them in the tank to thrive?
the tank is a well-established 10 gallon, with 6 harlequinn rasboras, one male cherry barb (and the now three pygmy cories)
i feed a balanced diet, do very regular water changes- no ammonia, no nitrite and very low nitrate. all the other fish seem happy and healthy!
any ideas? i really love this little fish and obviously i am doing something right, cause the original two pygmys seem to be thriving.