I have a Marineland 27 gallon cube, 20"x20"x18". It comes with a ML DoubleBright LED light. I want to establish a non-CO2 tank with no or minimal water changes. I would like to be able to grow low-moderate light plants. Can the non-CO2 method grow moderate light plants successfully? I'm inclined to purchase another light fixture to get better coverage and PAR front to back. I am looking to put a Finnex Ray II DD 18" LED on the front half of the tank and have the ML BrightLight for the back half and Moonlight feature at night. Both fixtures will be mounted on the rims of the tank. The concern I have is whether the Ray II will move the tank into the CO2 required category or produce algea problems. I think it will produce 35-30 PAR at the substrate level directly under the fixture.
Thanks for the help. I'm looking forward to my first planted tank