I found these last night in my 20 gal aquarium. It currently has a like 7 adult guppies and a bunch of mid-size to newborn guppies. Everything has been going well. I also have 3 ghost shrimp. I kinda let them do whatever in the tank and it pretty much cleans itself too. With some good filtration and lots of plants i don't do water changes too often. (I have tried having guppies like 3 times before and every time i did a monthly 25% water change they would always die after like 3 months. This time I started with a 5.5 gal then i upgraded like 2 1/2 months ago and it has been going great with me barely doing water changes maybe a 10-15% per month and usually filling it up when water evaporates) So here are some pictures of what i found last night. If they could be identified it would be great and i want to know if i should be worrying. All the plants I have were bought from a local pet smart and I've had them for the 2 /12 months and due to the size of the snails i don't think they came with them. I had a snail but I found it dead 2 nights ago. It was a mystery snail but their shells don't look like mystery snails. Plz help. Thank you!!