The 150 was the largest I could put in the location. due to the need to keep enough room for wheel chair access between wall and tank stand a larger tank was not fisable. There are too many systems with out adequate filtration, oxygen levels and replacement minerals and stuff. this system is to provide the best filtration and versatility I can put together so I can go in any direction I want. since I will be doing some aqua farming also, some of the pieces I have located are fairly expensive and have a year to two year wait period for frags. so it is my intent to not over stock the system. with the equipment I should not have a problem with that. All of the equipment will not run 24/7. some will be as needed and others are on controllers with probes. There is also a lot of automation built in so the majority will be automatic. top off, kalk, calcium reactor, dosing various items, etc. Ah now if in the future a bigger tank is doable the system support equipment will handle it. Thanks for the comments. The main skimmer euro reef rc 250 will be plumbed into the CPR cy-294 and receive its feed from the water returning from the tank and loop back to the the same chamber. Im working on that now. pics when done. Ive been working on the total system for 1 1/2 years. The equipment in the shed is premanufactured, I am only doing the modifications to integrate into the system. (hopefully water by June if not sooner). Thanks for the questions and comments.