> With regards to the cause. I am firmly of the belief that CO2 overdosing was > indeed the problem. Prior to the new DIY CO2 bottles being hooked up there > was no problem. After the hookup the problem happened. Measurements of pH, > Ammonia, Nitrite, Nitrate and hardness all were fine. No large variances A large amount of CO2 should have moved your pH noticably.....