i have a 100g fowler and a 65g reef,, in the past few months all i have done to the reef is i just put in a titanium heater and external controller..
...on the fowler i removed the hob overflow boxes, drilled 3 holes in the back and installed a "better" overflow box, reduced the substrate to less than half, changed out my 2 waterblaster pumps for 1 jebao dc 12000, re-did the plumbing to the tank and reactors, got rid of gfo and went back to phosguard, swapped out a marine sources rdc850 skimmer for a new vertex omega 180i, and added a lyretail grouper