Hey guys, I've been working on a stand for my custom 67 growout tank for a few months now. The tank has been on the floor in the mean time and have had no issues whatsoever with jumping. The stock is 3 snegal bichirs, 1 tuegelsi, and 1 marbled gar (pike characin). Yesterday I finished the stand and moved the tank also adding a juevenile black ghost knife. So far, 3 fish have jumped already, luckily I could save 2 but the tuegelsi jumped last night and I found him this morning and couldn't bring him back. All the fish seem 100% more active than before the move. I'm wondering what the difference could be making them jump? I had to do about a 85-90% water change to move the tank so that may be it? I also added new sand and setup a new canister on it. It is rimless, but I have a polycarbonate roofing lid with dumbbells on it so I thought it was secure. Please help as I don't want to lose anymore fish. Any and all inputs are greatly appreciated.