Phosphate HR ExpertLine measures values from 0.008 – 0.14ppm Phosphate build up in the tank appears to be a fairly common problem in marine aquariums.
Elos PhosfateHR test kit refill
Ammonia/Ammonium test for aquarium (NH3/4). Ammonia (NH3) is toxic to corals, invertebrate and fishes. At high pH levels (as in a marine aquarium) and at increased temperatures, NH3 can kill the aquarium inhabitants.
Phosphate test for aquarium. Phosphate build up in the tank appears to be a fairly common problem in fresh water and in marine aquariums.