If you got this tank what would you do with it?
My neighborhood just had a community yard sale. I got a 20g high for $3 including HOB filter, heater, 20w light strip, and some rocks I'll probably throw away. I just setup a 37g non-co2 low-tech tank. I'm trying to decide what to do with this tank. What would you do? Another low-tech planted tank with fish? A diy co2 planted tank? Planted shrimp tank? Brackish tank? I've got a ton of SMS left, so I'll probably use that for substrate no matter what route I go. Just wanted to get ideas.