I only have three fish - All perculas which I think are great and have had for 4 years now - I would love to add a few more fish and a Purple Tang
is top of the list - The only reason for a UV is to clean the water of ICH so as to have a better chance of keeping larger and more expensive fish alive -
Right now I have a very basic setup and do not want to monkey with it too much - I just use a wet dry underneath with skimmer- no refugium, no kalk drip
, no plenum. I am not sure the optimal way to set reef system up but i think I have a pretty nice setup so far. If a UV will clean the water better - Then I think it makes sense - If it will kill good bacteria that the tank needs- Then I will do without.