This was brought to my attention just two days ago by a friend. This species of yeast is not know to survive in seawater. Matter of fact there is only one know species that can. The dose is ?/? tsp / 400 gal and I find it hard such a small amount could do that much. The other issue I have is he sure it is Diatoms and not again mis-ID cyano. Next, just what the hell is it doing. Like I told my friend try it the dose is so low it shouldn't affect anything. Pretend it is a 50 gal tank. That would be ?/8 of ?/? or ?/?? of 1 tsp. Lol that is like ?/? of a aspirin tablet by volume. So, you are on your own.
1tsp is ~100 drops. So, ~25 drops by Vol for 400 gal. For a 50 gal that is like ~0.75 drops. Does that make sense in any way. And where the hell did he come up with that dosage. Maybe it is another Internet scam.