Welcome to TRT!!!
if your tank has only been set up for 2 weeks then you are in the initial
nitrogen cycle. it may have been a little early for the garf grunge.
have you been testing you ammonia, nitrite, and nitrate?
as far as algae goes you first start out with diatoms, these will go nuts about now and can last a month or two.
i usually suggest letting new tanks cycle for a couple of months before anything is added to the tank. i just let the LR cycle the tank.
what is your Kalk routine? i have a
kalk reactor that i have running constantly. a lot of people run both. they serve slightly different purposes, so i would keep your routine.
G~