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I like the ability between them to get different sizes. I would suggest for anyone getting one of these kinds of ceramic blocks/plates/cubes/spheres to get the biggest one that will fit the space you want with out needing to cut them. Could mean a block and a plate etc. They fall apart quite easily once fractured, cut, smashed, broken, etc.@jason2459
Which do you prefer, if any? And why don't you think @becks results will be sustained? Thanks for replying to my questions. I appreciate your input and help.
As for unsustainable in that the blocks create a great habitat for bacteria and other tiny critters and the poster could just be seeing the quick influx of growth. But they will need to be fed something.