Hello to everyone! I am new to the hobby, I have a 30 gallon bow front tank and still setting it up...I purchased a huge 800 gph water pump which said it was adjustable, but seems to be blasting too much water. I want to know if it's a necessity (I know it's best to have) and what is the smallest sized one I can get away with, plus the placement since it's a bow front. Thanks!