Tested it tonight, its a one gallon bowl. Yes, it will be a walstad bowl (would have labeled it as such but wasn't 100% what it meant). No heater or filter. If this really doesn't work out, I'll just upgrade to a 2 gallon, , but I just want to see how this goes. I have a halogen lamp, is this okay? For substrate I just want a teeny layer of potting soil and then sand covering that.