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Can they still perform the biological filtration once they are aged?

What about Marco rocks or the Caribsea life rocks?

If I keep these guys in a full marine system do I need to use rodi water for them? I want to keep them with some live rocks.

More photos

Can you guys tell is this a male or female? 6" size

Male 6.5 inches size $65 Pick up in Markham area

The size is 3 inches and I just brought it yesterday. I had already read that article but I am a little bit confused. In the article It said the female usually having some black spot on the dorsal fin but I saw some video there are lot of male also have those black spot on their dorsal fin.

How to identify is a male or female?

Sorry forgot to post pictures Here are the pics

Is it a male or female?

No problem with them I just curious that do I need to replace them or not. Thanks for the advice guys!

Do I need to replace my ceramic bio media?

Alright thanks guys!

More pics of the male

Pics of the male

Is this a female?

He is alone

You mean my light right?

I am using sand but my light is very bright.

Can anyone tell me what kind of tropheus is he and how come his colour is always so dark?