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it does'nt have to tumble but if it gets to thick of a layer for the light to reach all of it,then it will start dying.you have to keep the layer thin,like a couple inches.
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55g,t5,sump,monti,pavona,green hydnophora,echinophyllia,trumpet,open green and red lobo,2 toadstools,gsp,xenia, mushrooms,2 giant frilly shrooms,cabbage coral,yellow polyps,zoos, nepthia,kenya
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