I've been doing a lot of research the last few months and I was planning on getting a 55g for FOWLR and maybe add some low to mid light corals later on. I also plan on adding a DIY sump to my setup. I'm trying to keep this from being a very expensive hobby for now so I'm trying to give myself room to grow. My question is, ignoring the actual cost of the tanks, how much more can I expect to pay in supplies and electricity for a 75g vs. a 55g? I've noticed that for a 48" wide tank, the 75g isn't that much bigger. I plan on doing a lot of DIY items such as the sump, LR and the stand. Also, I live in an apartment and might be moving once a year for the next few years so I suppose the extra effort to move the tank that many times must be taken into account as well as potentially cheaper electricity than in a house. Thanks for your help!