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Thank you for the advises, I will check...likely to be 0/10

Thank you everyone, especially clownman. Sorry, I am not good in searching information. I have 4 anemone, 2 (brown colour and cheap) are hungry but the other 2 (very attractive but expensive. Yellow with blue tip and another one white with blue tip) refuse shrimp. Thank you.

Hello, I am new to marine. May I know 1) why the gravel and some parts of the glass wall turn brown after 2 weeks of setup? 2) why the anemone (from philipine, white colour with blue tips) not eating the shrimp? Or what is their diet? 3) is the doctor shrimp harmful (attack) to crown fish? Thank you.