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I use disposable welders bottles at the moment that are 36 bar and I have it fully cranked open. I think that maybe having the needle jet set to such a low bubble rate has some bearing on things. I'm using a cheap-ish eBay reg an needle valve with a JBL solenoid and thought maybe I might need...

I had/have the same problem. I have to set a higher bubble rate and the gas takes 15-20 mins, as nry pointed out,to push through to the diffuser after the solenoid opens.

True, but surely 4dkh water shouldn't register yellow 24/7 at 1bps for 6hrs a day. In theory shouldn't the fish be dead! and I certainly wasn't seeing rapid plant growth even with EI. I guess that ultimately the DC is only a rough indicator and shouldn't necessarily be relied upon.

I've had probs with my drop checker too. I was using tank water with the JBL fluid that came with my co2 kit but recently switched to 4dkh water so I could be more accurate. However, with the recommended 1.5 ml of water and 3-4 drops it was bright yellow by lights on after running for 2 hours at...