Fallwyn, you have two Golden Algae Eaters, Gyrinocheilos aymonieri, in a 30x12 in tank? That is not going to be possible as they can reach 10" to 1' in length, the equivalent of the heigh and depth of your tank. Plus, as they grow, they become more aggressive towards other fish, in addition to completely stopping eating algae at larger sizes. Bring them back to your fish store, wait a month or two until your tank is fully cycled and then get 6 otocinclus or maybe even a bristle nose pleco...