Well thats how many discus I have right now but maybe in 2-3 months I'll be taking out some of the runts and we'll see how many will be left. But they won't be fewer than 25. The ABS sheet comes in 4X8 feet. I bought them for $27 each and they're 1/16" thick. I originally thought of acrylic but when I saw this being tougher and only half the price of acrylic I went for it. I get the goop from work. I buy them at the price the company gets them, $47 a box of 12 tubes, but they're the same thing as the household, plumbers, or marine GOOP that you can get at wallmart. I actually used household goop on my first tank(settling tank), it's the cheapest but probably marine is teh best.Here's a pic of the goop that I used.