Apologies if this is a stupid question, but I was wondering if there were many invertebrates that are suitable for a soft water (<40ppm) aquarium. I've heard of a couple of shrimp species (amano and wood shrimp?) that seem suitable, but from what i've read basically all snails are off the table, so to speak, due to the need for minerals for their shells. I was origianlly hoping to keep several snails in a community aquarium, but of course if none are suitable for water of this type then I will definitely skip them. Please let me know as well if i am incorrect about the shrimp species i mentioned as well, as I would hate to make a mistake. Thank you.