24/7 DIY... though if I had pressurised I'd be using a solenoid and timer combo. Currently have to have bubbles on overnight and boy are they annoying!
I used to go 24/7 and found I had really good results, but after killing a Mollie and a white mountain cloud minnow through C02 poisoning I am a bit wary now.
I tried the solenoid route once, was to much hassle and to my mind just another thing that could go wrong. Keep is simple is my motto. The fish dont seem to mind the 24/7 CO2 and as we all know co2 stability is critical. If the solenoid broke and didn't come on when it was supposed too, that could spell algae farm. Why take the risk.
I was using set to be on/off before lights option for some time and now I am using pH controler as I have soft tap water (2dKH) and pH swings has been quite significant. Now I have got stable pH 6.5 all the time and less wastage on CO2. I bought cheap pH controler from Indonesia (about 60£ delivered) and it works very well.
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