My friend has an empty 30 gallon aquarium that will (eventually) be mine. I'm planning on doing sand substrate, and possibly live plants. For now I'm just brainstorming possibilities. One idea I had is doing a coldwater tank with dojo loaches and a big school or wcmm. What other coldwater fish are there(besides goldies)? That's just one possibility though, I could easily do a heated tank and have more options. I'm looking for some really unique and entertaining fish. Any ideas? Thanks a ton!