clams

I don't know much about them, but I do know that they're basically bulletproof cleaners like snails. I am acclimating them just in case. I've heard that they won't die except when opened, and that their cleaning abilities could even replace the need for having a filter. So, I'm excited. But I'm...

What is this. looks like a mussel or clam. not sure how it got in tank either. wasnt sure if its harmful to anything. 120lit 0 amm 0 nitrites 5-10nitrates kh& gh is fine ph 7.4 stock is 7 corydoras, 1 bristlenose, 7 rummynose, 3 zebra nerites, 6 cherry shrimp

I definitely made a mistake getting a clam... i didn’t know much about them before I bought it and now I’m here... can they live in a gravel substrate? And how should they be positioned? I noticed mine tries to bury himself but ends up half in the gravel and half out, I’m not sure if this is normal.