My DIY CO2 failed (connector sprung a leak) and I don't have time to fix it before I leave for a two-week trip. What's the bare minimum light I can use to keep algae down but keep my plants alive? I have a Finnex Ray 2 DS light on a 29-gallon tall with Dwarf Hairgrass, Alternanthera Reinekii, various swords, Moneywort, Anubias, and Bronze Crypt Wendtii.  I dose with Flourish and root tabs.

I may be able to jerry-rig something to get it working again, but if I can't fix it with what I have on hand I'll have to leave it.

My lights are currently on a six-hour split cycle, 9-noon and 6-9;  What can I change my photoperiod to to keep the algae down as low as I can but still keep my plants healthy?