Yeah. Just boil it for a few minutes so it sinks. I had others tell me about this. I have a pretty big chunk in my tank for my snails. Sometimes they rasp the bone itself. It also grows algae on it for them very easily. Just keep an eye on your pH level. I didn't notice any difference with mine, but some do.DylanM said:Do shrimp need a calcium source too? I'm sure it would also help my plants, so I'll look into getting one soon any way. Are you sure that it is okay to put bird cuttlebone in a fish tank? I have a few cuttlebones that I keep on hand for my senegal parrot, although I rarely replace them considering she seems to get all the necessary nutrients from the birdseed mix I give her and really touches the bone.