If i were doing a stand alone mantis system heres what id aim for... lots of lr in the tank the sustain the system. A 20g sump with a open 1st chamber, a sock chamber, and and pump chamber... (yes needs baffles)... i would stack the 1st chamber with rock and go wayy overboard with hermits and snails... let them clean up after the mantis for u without being wiped out.... + this can be holding area for your mantis' live food..
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