I have a 120G Fish Only Saltwater tank at work. After a Red Slime outbreak, I treated the tank with Red Slime Remover (Chemiclean). After a few days, the red slime disappeared, however the PH had dropped from 8.3 to 7.8 and went even lower in subsequent days. Any ideas on how to avoid this in the future? Is there a better product for Red Slime removal that doesn't decrease the PH? Thanks.