Tom

I can understand that so that narrows down my problem.
I have a 5 lb tank.....I went through the first one in about 3 weeks. I am now on my second tank...re-filled a week ago, it is now half full (going by the gauge)
I have checked (using dish soap) for leaks and can not for the life of me find any. I am at a loss.
I have CO2 tubing.
Going by my readings this tank should last for months not weeks.
I ry to keep the co2 flow at a point where the fish are acting normal.
Any suggestions?