Fighting Bryopsis

[zygote2k]

I have a Bryopsis problem in a 90 sps tank. Water parameters are:

ph 8.19
Alk 3.56 meq/l
Ca 458 ppm
Mag 1300 ppm
NO3 less than 14 ppm
P04 less than 0.03 ppm

Magnesium gets dosed at approx 25 ml 3x per week. I can't seem to get it higher than 1350. How much can I safely dose? I've heard that Bryopsis dies when the Magnesium reaches 1500 ppm.
I have Kent Magnesium.

This tank has mh/t5 lights, Euro reef skimmer, Vortech MP40 and a large CPR fuge that grows lots of macro. There is a Yellow Tang and a Hippo Tang, but neither seem to be interested in the Bryopsis.

What can I do?

 

[jcovercash]

You can bump up the mag 100ppm per day with no ill effects. Some people have reported some snail deaths but nothing other bad.

I bumped mine up from 1150 to 1700 over the coarse of about a week. Once it hit 1700 2 days later my bryopsis was gone.

 

[discocarp]

Also worked for me with Kent Tech-M and >1600 Mg. You can bring Mg up pretty quick. 100ppm is the usual suggested max dose. Here is a thread on the bryopsis/Mg solution (lots of good reading):

http://www.reefcentral.com/forums/printthread.php?threadid=1113109

and here is a great calculator to figure out how much Mg you need to dose in total (split it up over a few days):

http://home.comcast.net/~jdieck1/chemcalc.html