I ran PH at 8.9 to 9.2 DKH at 18 to 20 Ca at 700 and Mag at 2500 to 3000 ran No M/H and only VHO for 3 months and still did nothing to slow or kill its growth. I know for a fact I had the species called Byropsis Penneta . No animals ate it and we tried them all less the so called specialized slugs reported to maybe help control it ? None to be had and if they had access to them its near to impossible.. So out of a last ditch effort to try and avoiding taking the tank down with my Mag and all parameters still jacked up I cut off all lighting and blasted water flows right at the entire top shelf of the rocks and now dead sps corals that the algae had poisoned off long before the lights off deal . But that killed it off in about 2 weeks I say that looking for signs of new life daily. Starting to cut the old dead sps off of the rocks last week. Thats the bosses job .. But if you have a true case of this stuff good luck and keep use posted I fought it for 1.5 yrs and the Boss had to fight it fro 7 yrs . All from a live rock.. and this is the first tank I ever used a L.R in. The reported slugs are Dolabella auricularia Elysia subornata Verrill this is supposed to be the better of the two ?