Dude, you are growing java ferns, the last thing you need is mor CO2. having CO2 and slow growing plants means more BBA is coming. But you are spot on in getting more plants as it will help in reducing nitrate build up. Have you considered getting a nice DW branch and retying your java ferns onto it? then you can have some moss and nana petite and tiger lilies and other foreground plants to cover the floor.
How about getting a whiptail and some malayan shrimps to clear your algae. One whiptail is enough to handle your tank's algae.
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