I have 2 1.5 inch DBTs in a 55gal full of water and they have been in there since I got them as hatchlings at less than 1 inch. I have a fluval FX5 filter (about one of the most powerfull canister filters out there) along with a top fin 60 rim filter which produces a good bit of turbulence. My little guys stayed at the top at first, now they swim all over the thing, occasionally it looks like they are stuck at the bottom, but as soon as I go to reach in with a net they swim away pretty quick. Once I had a similair incident to yours. I found one at the bottom, very close to the fluval filter intake(which has 1-2in rocks all around it at the bottom to degrade the intake force) and it looked lifeless, so I reached down pulled it up out of the water, and it opened it's eyes, looked at me, and when I put it in the water, it swam away immediately. I think the most important things is that if they do run out of energy while at the bottom they need a way to manually climb up. Just be sure to have tank deco that goes from the bottom to the top in several places so they can easily climb up if they need to. After the one time I found one of them near the intake, I increased the rock buildup around the intake to reduce immediate force even more, since then I haven't had any problems at all. Maybe this helps, maybe it doesn't, I don't think you need another smaller tank, just some redecorating.

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