Ironically I'm dosing my 55gal with this stuff as we speak. I've done this several times in the past.
Yes it's ok to leave it in longer than 2 days. I've sometimes left the stuff in the tank for up to 5 or 6 days. (I dosed my tank on Tuesday night. I'm planning to put the carbon back in and do the water change on Friday or Saturday night).
I do follow the instructions though and have an air stone running in the tank during this time, and I do at 20% water change once I've done treating.
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150 Gal Cichlid tank, 55 Gal Cichlid tank, 42 Gal Hex Tropical tank, 2 Fluval Edge Tropical tanks.
And... 3 Miniature Schnauzers
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