I started a tank 5 months ago 125gallon as well no qt.. Got over 21 fishes, some from lfs''s some from members, did not have a problem til the last 2 fish from the same guy. They both got ich an wouldn't be to much of a problem except for the fact that I got coral and don't do well with copper based medication, so I went out and bought a biocube 29g.....I would say hold off until a qt, but if you're like me your not going to listen and keep getting fish, lol. Btw I have a biocube I could sell you as a qt....only thing wrong are the lights are burnt out, which is the way I bought and just used my LEDs until my fish recovered
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