i have water wisteria in my tank but ive noticed its not so green as when i bought it 2 weeks ago. its still growing up but the leaves have brownish tips. i just bought nutrafin plant gro to give more nutrients and a DIY 2litre CO2 bottle, how long will it take to see the results. i have 30w in a 10g tank with no special substrate.

There's just not enough light in your tank. Forget the co2 and ferts. You'll just grow more algae. You need better light.

Google SHO screw in flourescent light. This light looks like the new kind of household lights people are buying now to replace incandescents, but I think it's the best option as a relatively low-cost good light source for a 10 gallon.

Or you can get a better flourescent with say 2 x 35 or 65 or something watt light.

Or you could just grow low light plants of which I think are some of the best.

Bah, water wisteria looks like something you'd find in a salad anyway.....lol.