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For a 2gallon tank, a H.O.B filter with 60litres/hr or 200litres/hr is more recommended ?
Would the high flow rate in the system stresses the fish & inverts ?
The natural water current in the reef is going to be alot more powerful than whats going to be in your system. Physically having a fish in a 2 gal tank itself is going to be the stressful part.