Hi everyone and thanks in advance! I have a 90 gallon tank which i want to overstock. Right now the tank is being filtered by: * 2 aquaclear 110 * 1 sunsun canister hw-304b * 1 wet and dry with a 900gph pump and i want to add a 30 gallon barrel to basically make the 90 gallon into a 120. Questions are: *How many gph the pump for the barrel should be? *How to prime the barrel? *should the pump be at the top or the bottom or there should be 2 pumps? * should i fill the barrel with bio balls? all ideas are welcome.