Ramshorn temperature

I bought a plastic box (55L) and a filter,should I add plants or not?I don't care what the tank looks like.
 
I was planning on keeping the tank as simple as possible: fill the tank with water and add a filter,is this ok?Or is it better to add substrate,wood,rocks and plants?
 
I have some breeding in a 5 gal. bucket on my porch. No filter, no gravel, nothing, I actually had forgotten this bucket was there, and one day saw it and was dumping it out because the water was green, and saw tons of red ramshorns. All sizes. they must have been eating the algae, leaves that had blown in, and any bugs that drowned. Decided to leave them for the moment, and they have been in that bucket for months, the top froze over one night, but those snails are still alive and kicking.
 
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