Hello! I have had some mystery snails in my tank before, and i couldn't quite figure out why they kept dying. The max i had one was probably 2-3 months, and then a foul odor came. Some even died within a week. I wanted to get some new ones, but first want to know if my tank is suitable. I have a 55 gallon tank with a black moor, ryukin, and a lion head. I change the water about every weekend with a gravel vacuum, and there are a few live plants in the tank. I don't use any chemicals except for dechlorinator. I would normally let the previous snails munch on pellets if they came to the top, but do i need a special food? I would really appreciate any help!!
Edit: I also have a bubbler, which was not there when I previously owned snails, if that makes a difference.