I'm not seeing major issues with that. Maybe some diatoms if you are referring to the little bit of rusty color stuff. Making sure your DI output is 0TDs can help. Also, GFO may help if it's a silicate issue. Personally I think it looks good based on that picture alone.
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rebuild and recovery log:
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Current Tank Info: 180g mixed reef w/ a beananimal overflow to a dolomite RRUGF. | 20g long G. Smithii Mantis Tank
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