How big is the tank and how many bubbles per minute? If the co2 was at 150ppm the fish would be in trouble. What is their breathing like? Are they swimming around the tank normally?
Fish are swimming perfectly normally, discus and rams, feeding perfectly too
tank is a Jewel 180
I probably have approx 1 bubble every 2 secs or so, the red sea has a pump on it so I have the pump on for an hour and off for 30mins.
Checked ph this morning, around 6.6 and kh of 6, so this is now at around 37 ppm.
I have ordered a co2 checker, thanks for the info