This is probably a silly question, :? but I purchased some Blackwater Extract for my tank but now I'm not sure if it would be good for all the fish in it. I have 2 angels, 2 opaline gouramis, 2 kissing gouramis, 2 pearl gouramis, 2 clown loaches, l sailfin gibbiceps pleco, 1 albino aeneus...