Wow! 1.010 is heavily brackish for an Indo dat!
I'd expect to see a silver or NGT at 1.005 to 1.010, but didn't know Indos had that sort of tolerance. IME, fish are far tougher than your bacterial culture when it comes to changing salinities. You could probably do a drip method w/ airline tubing, gradually siphoning in FW from you tank into the bucket containing the fish and original 1.010 water. After several hours of acclimation, the dat should be ready for introduction into FW w/ no problems.