Preferably the less the better. Remember, dipping the coral will disinfect certain pathogens but it is also stressful for the coral. A 15 minute dip is really all you need.
I would dip the coral and watch for improvement or at least a stoppage of further deterioration. If I continue to see expansion of the deterioration I would dip again in 24 hrs. I do so only when I feel I am losing the battle anyway and I try dipping again. Sometimes I would take the coral & rinse it with RO water at the same temperature without any chemicals.... Very tough to stop serious deterioration. This method seems to work with the hardier corals in my case it worked on my Pogoda but not on some very special SPS. Good luck.
I just dipped my rasta (green finger leather) all of a sudden it appeared to have a cyano infection.... it was getting a necrosis look on some of the stock... i made sure it had plenty of flow and access to light...
it got worse... i did a 15min dip. it seems to have stopped the deterioration..... i will keep ya posted.... i moved it to my 20g nano to let is be by itself with no other corals....
My other tanks is a 20g with about 790g of flow.... two maxijet 1200's and a an ehiem liberty 200 power filter..... running chemi-pure, carbon pads and poly filter....
