Is this a low light tank?

your wattage is triple the gallons.... I would think it's not a low-light. Most people try to keep the wattage at 2-3 watts per gallon for a planted tank.

Since the watts per gallon rule breaks down for very low volume tanks (like yours) and very high volume tanks, I'd say that you've got a low light tank going there.

I would try to put another 9 watt light on. you could put some low light plants in there with 9 watts though.

Anacharis should grow in there along with the usual lower light favorites - java moss, java fern, anubias and crypts.

Agreed...

I would agree that it is a low light tank. In general for smaller tanks (10G and less), the light rule is thrown out the window.

For your tanks...I would say (and this is MY opinion)
For a high light tank - I would say around 35W+.
Moderate Light - 25W-35W
Low to Moderate Light - 20W- 25W
Low light - <20W

I have a 5.5G with 40 watts of directed light with 3 bulbs (one on each side and one along the back)

Also note that compact fluorescent lights pack more "punch" than NO fluorescent and incandescent.

Recommendation - get another 9W CF bulb if possible over that and you would be good to grow alot of plants. Otherwise, see above for lists of low light plants.

Good Luck

Aries

I stand corrected.