I immediately shut off the water to stop suction, and dismantled the python to create backflow to get him out. His body was badly contorted and I thought he was dead. But he was breathing, and within an hour or so, he was back to his regular shape, except that I think his spine is a bit crooked. He was swimming, but weak. Once the tank was filled back up, I turned on the HOB filter but when he got too close, he stuck to it. I put a large sponge over it and turned it back on, and shut off the lights so he would rest.
I half expected him to be dead when I woke up, but he wasn't. He's still VERY low key, not coming to the front of the tank or anything, but he's bouyant and swimming a little bit, not just sitting at the bottom, His color is good, except for a spot near his tail that looks scraped.
The water quality is excellent. He's just a little squirt and I do 50% weekly water changes, and the tank move yesterday involved a 75% WC. The salinity is quite low, about .002, which is short term as I'm acclimating some plants which have been in FW to brackish.
I checked and my Melafix is horribly outdated, so I'm going to get some today. Any other suggestions?