My biggest regret is I did everything as I could afford it, and went cheaper because there was always something else I was going to need soon. If I had it to do over again, the tank would have been without water for another 6 months while I accumulated the right stuff. Like lighting, pumps, plumbing, etc. I finally after 3 years have my lighting pretty much where I want it, and I'm about to set up the closed loop. About the same time, I'll be re-engineering my refugium. I could have done all this up front, for double the cost, but it would mean starting 6 months later than I did. 20/20 hindsight.