need help with ID: green poo on sand?

[PurpleMonkey]

Hi!

So doing my daily tank inspection and I've noticed what looks like green poo. It literally looks like mini "logs" of poo.

Is it what it looks like it is? I have 2 chromis and a bicolour blenny in the tank. Only noticed them after I added the blenny so I think its him but I just wanna check.

If it is poo, what do I do about it? Do I clean it up? Or will something else take care of it?

Thanks!