So i have a 30 gallon long fish tank that has 1 BN pleco,1 red tailed shark,3 kuhli loaches,3 nerite snails,1 panda cory,1emerald cory,1 peppered cory,1 juli cory, and 1 albino cory. I got 5 different types of cories because the the guy at petsmart said they would all school together,but he was wrong they dont school together at all. So i was wondering if i could get 2 more of each cory without overstocking my tank. On aqadvisor it says my tank has 198% filtration and my stocking level is 69%. So please tell me if you think i could add 2 more of each cory. Also i know my tank is too small for a red tailed shark but hes small now and im upgrading soon and im going to put my BN pleco and red tailed shark in the bigger tank.