I would of course get a bigger tank. But, the main things I would change is, I would have not added any real live rock or any frag plugs from other people. That would help me avoid some of the pests I've picked up (bubble algae, bryopsis, etc). I would have also set up a quarantine tank from day one. That would have saved me a lot of money. I ended up getting AEFW which took out a bunch of very nice SPS frags (I have since successfully treated and I am AEFW free thankfully). I also ended up getting ich from not quarantining fish and I lost a couple of really nice fish (achilles tang was the most heart breaking one).