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I set up a 20g long Walstad tank 2 days ago. I have a heater, but no filter. It is divided in half because it houses betta fish.
Setup:
1.5 inches organic potting soil
.5 inches gravel (~3mm-6mm size)
lights:
crappy LED that came with the tank hood
13 watt florescent desk lamp (6500 k)
1...