Originally Posted by bpro32
OK so basically a 20 would work but a 30 is better? and if i have a 20 gallon sump for a 90 gallon aquarium do i need a heater for 20 gallons or 110?
a 30 would be better because of water volume, get the larger heater, put it in the sump, then regulate temperarture accordingly.. start out at cooler temps,, then raise accordingly to your desired temp..