I got the Spiny Sea Urchin. The puffer has not gone after it at all, and I already know the size of the tank is too small for the tangs.
They were a rescue as the yellow was being beating by the other fish and had it's fins nipped off. The LFS
put it into a smaller tank and it was getting worse because he had no room. I purchased it and now it's healthy and the fins are all grown back. The Yellow Eye Tang was because he was in a smaller tank looking stressed. Both Tangs are healthy and have enough swimming space until I get a bigger tank.
If the Urchin gets too big, I will just exchange him for another one. My normal LFS
is really good and being I spent a lot of money in their store they treat me like a king. LOL So they already said they will just exchange it out if it gets too big before I get my 180 gallon. Which I don't think will be a problem being we will get it by the end of the year.
I am going to turn my 55 into a reef..
My wife and I are already saving for our 180 gallon tank. We already decided to upgrade to a bigger tank. Most websites and books say a 55 gallon is good for the Yellow Tang, and a 50 is good for a Yellow Eye. Live Liveaquaria.com says the Yellow eye needs a 75 and the yellow needs 100. So with all the multiple sources saying different things, I tend to believe I my fish are ok, plus I am really upgrading.
The Tuxedo Urchin according to Liveaquaria.com only needs a 20 gallon, and the Spiny only requires a 1 gallon according to some websites. lol