26W of T5NO is not much light. You might need to look at upgrading to LEDs or a dual t5ho. While the wattage isn't far off, the PAR at depth for these lights would not be very good. You could try a frag and see how it goes and see if it will get you by for what you want to keep. Worst case, you have to upgrade after a couple of weeks, but you might save yourself the upgrade cost if it works out.