gradual bleaching

pells61

New member
Hey guys,

most of my hairy mushrooms (Rhodactis indosinensis) and leathers have been recently expelling their zooxanthella as well as a small patch of Zoos, but they seem to be loosing a very small amount. All my SPS, LPS, clam, and chalices seem to be unaffected, in fact most coral seem to have massive polyp extension and great color other wise.

I have a 58gl rr tank with a 55 sump, total water vol is about 70ish gallons. I have had a problem with bryopsis that was due to elevated phosphate levels which i have been slowly reducing with the use of 10gl water changes weekly and ferric oxide ran in a small media reactor and carbon in another. After a few months my phosphate levels are now undetectable, using standard test kids, and I still run my same weekly water changes and monthly media changes. recently I have found that my Magnesium levels have dropped to 1040 ppm I have been using tech M for 4 days now dosing 90 ml per day. I know this is wrong of me and i have correct to 70 ml once a day. My mg level have not gone up too much as far as i can tell. Also I have found my salt creeped up to .27 once or twice in the last week, I typically keep it at 1.026 my tank level are as follows:

Ca2+ 420
mg 1040
salt 1.025
dkh 8


I hope anyone can offer me some advice as to what i have done wrong if anything and some suggestions to help correct my problem.

Thanks for your help,
ADP
 
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