This tank is approx 700 long 500 wide 600 deep, the light is on a timer 6:30am to 9pm. The 3 largest and longest leave on this plant are basicaly on the surface of the water which is maybe 100mm from the light, surely it would be getting enough of what it needs from there ?
Sorry halide lights are out of my budget, I was waiting either for my LFS to have lights on sale and buy another double unit or look fo rone of those industrial ceiling fittings 700mm long with four tubes, so long as I can buy tube to fit it that are suited for use in aqaria.
I'll have to buy my fish some sunnies then.