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In the center there is some type of brown moss growing. Nasty looking stuff.

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seems that the bottom is starting to pull up and apart from its base on some of these guys. Also notice what I believe to be brown algae growing around the lower parts on some of them... two new pieces added, my first corals. I love this rock because of the deep red colors. not sure what I think of the black sponges. Also more common on the other side is beige colored sponge. It's good for the water right? The green on the right side of rock (sponges on it) towards the underneath, this green looks like hair algae but it's more of short grass that doesn't move with current... In the center there is some type of brown moss growing. Nasty looking stuff. me My tank. Sorta dirty. Need to vacuum gravel/sand. Starting to get red algae growth. Considering adding one more piece of rock to fill the right corner, but I like having a bit of a sand box exposed...