Malaysian trumpet snail quarantine

[Dr.rex]

Hey y'all I got these Malaysian trumpets in today put them in a quarantine tank 10 gallon ph7.2 gh 300+ kh 80-100ish A,0 NI,0 NA,20-30 temp 82ish, with the medtrio, (there a ebay from Florida and look like pond raised, so zero trust given) but my question is, do they "require" a substrate because they've pushed up my filter and stuff, and there trying to hide under anything they can and I'm just wondering is it okay to keep them in a bare bottom med tank for the week or should I add some kind of substrate

[Cory]

They don't have to have it. they are much more active with dim light. Also when food enters teh tank.