Most of them just sunk straightaway and the rest that did not, i glued them to the others. But they're pretty porous so the water that got inside them helped alot too !
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Started this tabletop marine tank a few days ago and have added in some lava rock, red bamboo algae and some sea grass and a chromis. ☺
Any idea what to put inside once the cycling is done? I'm thinking about a mandarin but I'm not sure if some chaeto and support a pod population