can someone give me ideas on an under water shelter for my 3.5 inch snapping turtle. he likes to hide under my filter and im sick of puting it back where it goes like 5 times a day. please don't say rocks. my map turtle just died two months ago becouse it got caught under a rock 
this is my first time owning turtles (i also have two red eared sliders) so any other advice would be good.
this is my first time owning turtles (i also have two red eared sliders) so any other advice would be good.