Can you use pulverised or pelletized limestone in a DSB? I thought I read somewhere that it is possible but I can't remember if I did or did not. I would like to use about 15% in my DSB(if it is possible)
I'll break from my hiatus to say that Crushed coral, Gravel, or anything that resembles that will set yourself up for failure, The critters that make live sand live cannot live in there and you will get muck and gunk under things which will slowly poison your tank, go with sand or bare bottom
i would say since its not making up your entire sand bed, the finer the better. Meaning i would use pulverized.
Limestone is calcium carbonate just like live rock is, so its a good thing to have in the tank really, still not as good as LR, but it def. shouldn't hurt anything.