lol, thinking about your waterlevels will not cut it.
You have to test them, to be sure.
I think that you could have some nitrite and ammonia present.
But that's only thinking too.lol
Mind you you would still have to cycle the tank, so that would be another 2 months for your O's to be in the 55Gl.
Good idea to up the wc anyways, but the test results could tell you if more or less maintenance is nescesary.
Do you have a liquid testcase at your home?
And do you use Prime when doing waterchanges?
btw your fish do have a lovely colour and look healthy, except for the spots.