There are a variety of sources of ammonia in reef aquaria. Minor sources include: 1) tap water (especially if it contains chloramine and is not treated with a deionizing resin) and 2) impurities in salt mixes and other additives. It has previously been shown that the total NH4-N ranged from 0.55 to 11.9 micromole/kg (0.008 to 0.17 ppm total NH4-N) in an analysis of eight brands of artificial seawater mixes. At the higher end of the scale, those levels will be detected with an ammonia test kit and can present potential toxicity concerns if fish are kept at those levels (see below). These levels of ammonia may be introduced from impurities in calcium chloride and magnesium chloride, where ammonia is a well known impurity resulting from some of the commercial manufacturing processes used (such as the Solvay process, which involves ammonia).
Tratto da:
http://reefkeeping.com/issues/2007-02/rhf/#5
Comunque, se ammoniaca no problem perchč i batteri e le alghe se la mangiano; se precipitazione dim calcio-carbonati, precipita senza alcuna conseguenza per la vasca futura.
Infine, io ci metterei batteri, aiutano a consumare l'ammoniaca.
Luca