Hi guys, Thinking of getting a new tank and just trying to weigh up the lighting possibilities. Looking to get a 5ft tank, comes with 4x 36W T8. Now, on larger tanks they say the wpg rule doesn't work so well. So i'm wondering just how good this is. I'm not wanting any carpeting plants, but maybe some slightly demanding stems. Limnophila Aromatica perhaps. Also thinking about the brightness of T8's, now that im used to T5's on my smaller tanks. Further along the line i might upgrade - would 2x 54W T5 be enough? I might prefer 4x 39W T5 actually. Thanks!