Sheng,
Please post in the correct forums. This should go to Equipment and accessories instead of freshwater fauna.
Anyway, your question is too open ended. Let's start with...
01. What is your tank size? ? X ? X ? ft
02. What fishes do you keep and how many do you have?
03. What kind of filter are you currently using?
04. What do you feed your fishes and how often?
05. Do you have plants and substrate in your set up?
With this kind of information, you will get better answers that is suitable for your setup.
Cheers,
I have dwarf cichlids in my tanks! Do you?
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