Has the tank the cycled yet? If not, are you planning on using the LR
to start the cycling process? With a new tank you can add the LR
anytime after getting the SW
mixed and to the proper specific gravity and temperature. Ammonia produced by die off from the LR
will get the nitrifying bacteria growing and the cycle going.
I also have a 20 gallon with a prizm, 2 powerheads and about 30 lbs LR
. Let the LR
do most of your filtration. I would only run GAC
in canister, no filter pads, they can cause more problems than they solve. Rely on hermits and detrivores for your mechanical filtration. Otherwise happy reefing.