So I've been out of the game for a while now, about 4 years and I have a 29 gallon and 55 gallon I'm trying to set back up. I plan on buying a 75 gallon and using this one as my main fish tank, just a simple FOWLR with some tangs and stuff. Then I want to turn my 29 gallon into a small tank like a FOWLR but I just want it to be one of the mantis shrimp only tanks and build him a cave and let him be in there. Here's my question... Can I filter both of these down into the 55 gallon and use that as a large refugium with lots of live rock and sand and a protein skimmer? Would that work and be good? And also how would I pump the water back into each tank? Two seperate water pumps. I'm scared I'm going to try this and overflow one of the tanks or something like that, I'm iffy about the two pumps and the tanks all staying the same water level. Anyone got any advice? I'd greatly appreciate it.