Here's what I've come up with on how to get rid of it. First, do not scrape, pull, nor try and rub it off. It's a deep rooted type algae and will only grow back, ten fold! There are no known fish that will eat Bryopsis. A few may graze on the newer shoots but again it will only grow back thicker. This is what I've found on ways to get rid of it completely.
1. Trendy Magnesium Solution
Some reports of a Bryopsis bloom mysteriously correct themselves over time and in fact, may disappear altogether where water quality is kept in good standing. This may go a ways in understanding why some people are insisting in the latest trend of elevating the levels of magnesium from the normal range (1,280 ppm) to 1,500 – 1,600 ppm. Most aquarists who have tried this method feel it is the fastest and least detrimental way to correct the dilemma. The theory behind this is that the magnesium stops the photosynthetic processes in the Bryopsis, but does this without affecting other desirable macros and life in the reef. There are some, though, that suspect the elevated levels of magnesium can kill desirable invertebrates, so as with most things in reef keeping, slow is best. Also, ask yourself, would you rather chance losing some snails or some corals?
2. The pH Solution
A similar method to try is while aggressively protein skimming, elevate your pH to a steady 8.5 for three weeks. It would seem that low ph/alkalinity ratios seem to aggravate an outbreak.
Bryopsis Algae
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