there is a real discusion with skimmers with horses some say they are harmfull and some say they needed. I never had one I used a canister filter and realy lightly stocked the tank (4 poneys in one 60 gal) Mine bread many times. NO air bubbles the male horses and fry can injest the air and die from it (I lost a complete batch of fry from putting bubbles in it) Buy lots of eather fake or real seafans for them to hitch on.
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