I would put him in the 55 gallon but not fill it all the way up. I'd put around 35-40 gallons in the tank. I use gravel with mine(7 3/4" carapace) and he does fine with it. As far as sinking pellets, he'll "sniff" around on the bottom if hes hungry and find uneaten food. I wouldn't keep any other turts in with him b/c when he gets bigger, he might become agressive and bite the other turts or might try mating with them and end up harming them.
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1.0.0 Chelydra Serpentina Serpentina --- Snappy
0.0.1 Clemmys Guttatta --- Speck
1.0.0 Graptemys Pseudogeographica Pseudogeographica --- Chomper

0.1.0 Eublepharis Macularius --- Sabrina

0.1.0 American Staffordshire mix --- Daisy

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