Jorge Posted December 6, 2014 Share Posted December 6, 2014 What could be causing areas of my sand bed to stain a greenish yellow color? I run carbon and rowaphos. I change the media every two weeks. Both media are in its own reactor. I also replace my socks with clean ones every seven days. I noticed it was also growing on the stems of my zoas causing me to lose a few. I have been able to save most of my zoas by dipping in lugols but would like to correct the problem. Has anyone else running gfo ran into something similar? Parameters: Dkh 8.4 Calcium 440 Magnesium 1600 Phosphate .04 Could it be gfo dust? I realize my mag is a bit high but I doubt that's what's causing it. Maybe I'm not replacing the gfo often enough and it starts leaching phosphates back into the display? My ro/di top off did reach .01 for a couple weeks before I was able to replace cartridges. Ideas, thoughts, concerns welcome. Thanks 2 Quote Link to comment Share on other sites More sharing options...
Jorge Posted December 6, 2014 Author Share Posted December 6, 2014 Also wanted to add fwiw. I feed two cubes hikari spirulina brine, and 1 cube hikari mysis daily. I occasionally add NLS pellets and 2 to 3 times per week ON algae. I soak and rinse the frozen food always. Quote Link to comment Share on other sites More sharing options...
matty Posted December 6, 2014 Share Posted December 6, 2014 If it doesn't blow off, probably coraline algae, it can come in a ton of colors. Quote Link to comment Share on other sites More sharing options...
Jorge Posted December 6, 2014 Author Share Posted December 6, 2014 It doesn't rub off. That's what I was thinking as well but the fact that it looked just like what was on the zoas is what had me concerned. Quote Link to comment Share on other sites More sharing options...
kriz2fer Posted December 6, 2014 Share Posted December 6, 2014 It's coral algae. The green stuff is algae also. if you stir your sand bed frequently it's helps. Quote Link to comment Share on other sites More sharing options...
Jorge Posted December 6, 2014 Author Share Posted December 6, 2014 You mean coraline algae? Maybe I'll gently move the very top layer around a bit more. I did it once but came right back. Quote Link to comment Share on other sites More sharing options...
kriz2fer Posted December 6, 2014 Share Posted December 6, 2014 You mean coraline algae? Maybe I'll gently move the very top layer around a bit more. I did it once but came right back. Yeah its just hard writing certain words on this cheesy phone. Quote Link to comment Share on other sites More sharing options...
Jorge Posted December 6, 2014 Author Share Posted December 6, 2014 Haha all good. I thought that's what you meant. Thanks Quote Link to comment Share on other sites More sharing options...
goldenbasketreef Posted December 7, 2014 Share Posted December 7, 2014 +1 on coraline algae, that shadow spot may be hit by disco effect of the led shimmering. So only green color become dominant. Letting more light in that area or stir the gravel should fix it. Quote Link to comment Share on other sites More sharing options...
Jorge Posted December 7, 2014 Author Share Posted December 7, 2014 Ok cool won't worry too much. It doesn't look like any of the other coraline algae in my tank and is why it had me concerned. Thanks Rudy. Quote Link to comment Share on other sites More sharing options...
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