I just moved from a 90 gal
to a 20 gallon reef and I feel like it was an awesome move. I make a very good living, but with two kids in day care ($1200 per month) etc, the strain of having to save for the tank was becoming a hassel... Besides what looked like a scrawny 90 gal
looks like a tropical paradise in the 20... I'm up to 8.5 watts per gallon and can grow almost anything.
Water changes are a snap, which means I can do them more often with real seawater vs mix.
And finally I don't have to listen to that **** Iwaki pump anymore!!!!
I feel like the weight of the world is off my shoulders and am looking forward to turning the 90 into a simple freshwater tank.
My only regret is getting rid of the live rock and much of the sand that I collected over the last three years...
Good luck with your decision.