Re bubbles, I meant coming from the filter output into the tank.
Drop checkers require two different liquids. One is the PH reagent, 2-3 drops, and the other is water. 4dkh is the proper solution to use for the water. Tank or tap water will still show a response, but it wont necessarily be an accurate reading.
For leak checking I use the stuff kids blow bubbles with, comes with the plastic rig you wave around. Soapy water works fine too. The bubble stuff is just more convenient and easier to rely on ime.
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