is it possible to make a scrubber that can easily adjust from 1 cube per day to 5? reason i ask is because my tank has only 2 clowns, 2 engineer gobies, a file fish, 3 peppermint shrimps and just crabs ect. my tank is 8ft so i want to add alot more fish but right now i want to get my nitrites and phosphates down before i do which is why i want a scrubber but if i make it for 5 cubes then its not going to grow algae as ill only be feeding 1 cube. so is it possible to just get a big screen and just adjust the lights?

cheers