Lol well as long as you don't buy anything that will fit in his mouth you'll be ok, live rock in the background looks good too! I got a 400 litre tank plus sump (sorry I know this is an American site but I don't work in gallons plus an American gallon is different to a UK gallon - gets too complicated lol.) With some chromis, engineer goby, a bicolour angel and a sailfin. I won't be keeping coral other than maybe some zoas and mushrooms to live'n up the tank. I did have an amazing volitans but my housemates mate me get rid of it because it was so lazy - was gutted! Really like boxfish but they get huge!