Now just to throw a spanner in the works, a cat amongst the pigeons, more random speculation amongst reefers....I have been dosing vodka now for about 4 months. I had some nuisance browny slimey wispy algae (not sure what that would be in latin) I used the usual 1ml per 100l split into two doses a day. It seemed to clean everything up except a few bits that kept a foothold through some zooanthids.
As per usual in reefing the result was two edged - some LPSs seemed to flourish more, some of my 'originals' seemed to keep more retracted. I noticed a slight loss of colour around the edges of some my SPSs (in my relatively high nutrient tank there was always plenty of colour but 'dull').
I stopped dosing vodka 3 days ago and the LPS corals I was worried about are expanding more... :-? What do I like more...or less...