Hi There…..the source range should NOT be used with any other products …… this could be issue 1…. The second issue could be that you have used clay pebbles around the AirDomes, did you pre-treat these before use … ideally they should be soaked in pH 5.5 with 1/4 strength feed for 48 hours and then the solution poured off and NOT rinsed….. However they are not necessary if the media is open… please look at the catalogue on the website as there is lots of information here….. if using AirDome I would also suggest that you up the perlite content to maximise the effect of the AirDome