This learning center has no Co2 in use..but plants are luxuriating in growth. I got a little pithy until I learned its for kids and underfunded. In that sense,they've done a great job and any 1,900 gallon plant tank that uses no Co2 and small filters...relying on plants mostly to absorb toxins is my kind of aquarium.
The Lace plant in one of the other aquariums...be alert!
The Lace plant in one of the other aquariums...be alert!