No phosphate kit, but I will get one. No spikes at all. Water params are No ammonia, no nitrItes, 15ppm NitrAtes. This tank is unplanted. I do 35-50% weekly water changes, my NitrAtes never build up passed 15 ppm. The reddish stuff is like algae in a way, but reddish brown not green. I ussually remove the rock and scrub the stuff off then it comes back slowly. I have hard water, and sunlight directly hits the tank in the morning for about 3 hours.