After checking in the basic substrate item implementation yesterday I got to thinking - never a good sign.

The original idea was to have some pre-set types of substrate - garden dirt, rock, potting soil, pellets, whatever. But how would these items affect the snails and the jar? Would I need to invent some sort of set of attribute templates? Like “Oh well this garden dirt item is going to decrease jar temperature by 1C.” and “Oh well some snails somehow don’t like gardend dirt and prefer other substrates”. But why? Why would a snail prefer one template to another and how would this be decided?