I don't dose anything that I can't test for, with the exception of the Chemiclean (the ingediants of which are a closely guarded secret). Even the food I add to the system can be tested in a way: through testing the biproducts of it (nitrate and phosphate).
In an ULNS (which this system has sucessfully now become, and this has me very pleased), it is important to feed SPS. To give you an example of how low nutrient this sytem is, I haven't had to clean the glass in nearly two weeks. There is zero algae in this tank (though there is still a little bit of cyano).
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Shelley
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