I've been told on Plant Geek that plants under lighting higher than 2.0 wpg will require CO2 injections. For low-light tanks without CO2 it's best to have anywhere between 1.0 - 1.9 wpg. If you use a nutrient rich substrate it's best to have 1.5 - 1.9 wpg, and if you use inert substrate (regular gravel), 1.0 - 1.5 wpg should suffice. Only remember that not all plants will thrive under 1.0 - 1.5 wpg. It's best to have low-light plants for lighting between 1.0 - 1.5 (like Anubias, Java fern, Java Moss, Water Sprite, for example). Medium-light plants, like Amazon Swords and Cryptocorynes for example, will do well between 1.5 - 1.9 but they'll also need a nutrient rich substrate.atmmachine816 said:Ok I plan on getting 2.24wpg in the next few months hopefully it will survive till then then it can thrive.