daveuk

Hi i have two tank one is 7x2x2 other is 6x2x2 i want to have many plants low light plants like the elodea densa

I was thinking of getting two 80watt lights on t5 on both tanks with refiector fixing them on the inside of the hood.

you think this be ok?
Thanks

Plants
Elodea densa
Eleocharis vivipara
Marsilea quadrifolia
Vallisneria spiralis

eiginh

Whoa you have a 209 gallon and a 180 gallon tank! I'm Jealous! I measured it by feet... Anyway 80 watts is too low for your 209g tank b/c you would only have .38 WPG and .44 for the 180g tank.

Nutter

I agree totally. You need to get that up to at least 1.2-1.5wpg, even for low light plants. They are pricey, but will get you the intensity you need with fewer tubes. They do cost though. I nearly fell over yesterday when I saw the $614aus price on a 6ft fitting with 2 x 4ft tubes in it.