picked up a used tank on Sunday. (What a lovely couple). I had the tank filled to loosen thick buildup on back glass and overflow box. I got concerned when I emptied the water today. The vertical caulking, and the complete bottom caulking is floppy. Is this safe to use? Don’t need 75g on the floor one day. If it’s not safe, then I’ll get a new tank at reef -a -palooza