8w Light

[Fish_mouth]

this tank i got has a built in light wich is 8watts and wondering if i called grow hornwort as i found some in the river. I have a 4.9 gallon tank. I cleaned the plants really well.

 

[George Farmer]

Give it a try. Floating it will give you the best chance as it's near the light and gets CO2 from the air.