well i have a tank set up that i was breeding convict cichlids in and about 3 days ago i did a water change and cleaned the sponge filter and then yesterday i noticed that the fry started looking sick and the adult male convict didnt look too good either. the fry started getting thin and last night started dying off. i lost about half the fry already. what could be wrong?
when they spawn again (in 2-3 weeks with good feeding), DO NOT clean the sponge filter.
sponge filters are great for fry tanks, as they support a micro-biological community that is an excellent food source for newly hatched fry.
when you do clean your sponge filters, all you should do is squeeze them a few times in a bucket of water from the same aquarium. this will unclog the filter,yet permit enough of the good bacteria to remain and repopulate the filter.
reef man, i am so glad you didn't ask about reef tanks.
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