I have a sulphur denitrator, korallin s series. It's been in use for a while but im fighting a low ph problem. Just checked effluent. Nitrate 0, Nitrite 0, ph 7.8, phosphate 0.15 to 0.20. Flow is dripping almost to point of a slow stream. Effluent is directed to a media reactor filled with aragonite. Tank ph approximately 8.1. Also have a red cyanobacteria issue in main tank. Trying to keep ph up but controller keeps dosing kalwasser to maintain ph. Are sulphur denitrators that much of an issue for ph? How am I dealing with cyano?