Join Date: Dec 2004
Location: Prior Lake, MN (Twin Cities)
Walstad states that you can have a tank with no filtration, for larger tanks most people use a power head, but I have a 7.5 that has no tech, no ferts, light (except natural), no heater, and no water changes, I just top it off. Nothing but plants soil and gravel substrate and water. I do not have shrimp in there but I do have plenty of snails.
I would lightly stock the tank fish wise if you want to keep shrimp though.