you need to feed them. Pods eat phytoplankton so feeding your tank with live phyto will greatly enhance the pod population.
This is often why we don't see much pods in a ULN system, nothing for them to eat.
A mandarin can be trained to eat other type of food. I feed mine with live white worms (easy to raise with a starting culture), fish roe (caplan eggs) and bloodworms (occasionaly). If you can get an ORA mandarin, they are tank raised and already trained to eat.
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More fish die from human stupidity than any other disease...
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