looking to set up a 20-40 gallon tank (undecided between a 15g cube, 20g tall, 20g long, or a 40 breeder), would this light be sufficient to grow LPS/some SPS in these size tanks and would I need two of them for the longer tanks (20g long or 40 breeder)? the light in question -> hygger 36w



You can use HOB overflows to a sump, or in a lot of cases you can drill a standard 29 for an external overflow. You can run a 29 gallon with nothing but circulation pumps inside the tank, and routine water changes/dosing as needed.