Ya Ive had the ABF with the skirt tetras for a bit and in size hes quite bigger, but he doesnt bother anyone, im a little worried about the neons but they swim so much faster than my ABF. Question, I have java moss and vallisneria in my 29 and my 10, and they will be going in my 75, do i need more than sand for substrate? They were fine with reg. lighting and sand in the other tanks but im not sure if it matters that the tank is now a lot bigger. thanks in advance for your help