I'm returning to the hobby after an absence of a number of years. Background- 12 years in hobby, fish-only, then reef. Had a marine/reef setup/maintenance business in NY. Wondering what changes have happened in interim. To help, description of my former 75 g. tank- reef, LR/Berlin filtration, sump empty except for occasional chem. bag and pump to MTC Power Pro 48" skimmer. No refugium or plenum; had approx. 2" live sand on bottom. Lighting was 2- 10,000K MH w/ 2 actinic 40 w. in an Energysavers hood. 2 powerheads on a wavemaker in back corners of tank. Chiller- 1/4 hp. Water changes done monthly- about 10%. Started w/kalkwasser, then switched to ESV's Bi-Ionic. Mostly soft and LP corals; some sps. Used hermits, tiger tails, snails for algae/detritus control. My guess is that lighting has changed the most, would love to hear comments, suggestions, criticisms<g>. Thanks!