so is this really needed for DIY CO2? Good thing I wasted the money on a kH and gH tester.
90G - CA community tank (Jack Dempsey, Fire Mouth, Blood Parrot). 8 Tiger Barbs, 3 Clown Loaches, 3 bristlenose Pleco's.
20G (tall) - Planted. 4 neons, 8 rummy nose tetras, 3 ottos.
5.5G - Dwarf Hairgrass playland for Beta and 2 ottos.