Awesome, thank you very much! Someone was trying to sell him a crocea and a maxima, and I didn't think that was a good idea. But, since I have no experience with large tanks, clams or t12's I figured I should ask.
And judging from your sig... I'm guessing you know what you're talking about
Thanks for your help!
For a derasa, what would be a good placement in the tank? With their lower light requirements, would it be ok down on the sand bed? This would be ideal, as the tank is in an elementary school, so the lower the clam is, the more the kids will be able to see it.