i'm using just a regular aquarium light i believe is 18 inches and at first i was giving them 12/ 12 light.....then i found out that's not the right light cycle and three weeks into their growing....now i have them on 24/7 and will that harm the plant in any way? it seems healthy...it stands on it's own with no help....at first it was sagging and leaning real bad but after i got it on 24 hour light it got the point where it stands up on it's own. how long will the 18 inch light be ok to use? i don't have any money righ tnow and no way to get any to get bigger floro's.....and i cannot afford no HPS lights