It was from a buddy's tank that he had for a about 2 months saw no reason to QT.
qt is essential to a healthy dt...your bt has gone thru at least 3 systems in the last approx. 3 months, wide open to many headaches...
keep lights off and keep feeding him often, it is possible he is checking out the tank when the room is empty...good luck...
toss up some pics...
tk
not the best pic but looks well... beautiful throat coloration...


Those clams fresh, or frozen?
Fresh... Well, kinda. I buy them live bulk from Costco, freeze them, then thaw them out. Good thing is that when you freeze them and thaw them out in tank water, they pop open, so you don't have to shuck them...