Hi all! So I have a 20H Top Fin kit from petsmart. I would like to grow plants in this tank, but I know that the lights they gave me are way too low. In the hood, the lights say it is a florescent 15W All Glass Aquarium bulb. It looks like I can pull out the bulb in the hood and replace it with a different one. The hood is 24" long I believe but I'm not sure how long the bulb itself is so I'm not sure how long the new bulb I need to get should be. Does anyone have any recommendations on what bulb I should buy to replace the one in my hood? Any help would be so great! I have some pictures of what my light fixture looks like: