Mebbid
Aquarium Advice Addict
So t5hos are considered low light?
... what length should my fixture be for a 125 gal?
And you recommend leds?
Is the pps pro / ei method reasonably priced?
My plants seem like theyre doing good..minus the algae on the java ferns...
the specific light fixture is going to play a big factor in the par levels in a tank. Coralife in particular are very weak as far as light level goes.
A 125 gallon tank is approx 23" tall. At the substrate level the par rating on a single 2 bulb coralife t5ho fixture is approximately 15 which is at the low range for low light level. This will decrease even more the further off center of the light fixture you go.
For medium light you want to shoot for a 35 - 50 par level. Here is an article on par levels of different fixtures.
Lighting an Aquarium with PAR instead of Watts
Both the PPS pro and EI method are dirt cheap. For my 55g and 10g planted tanks a single pack of ferts will last me the better part of a year. PPS Pro lasts longer though.