Would you use an undersized uv sterilizer?

[Daddyrawg]

For the time being as I upgrade tanks I have a sterilizer good for a 90 but not 180.
Would it be useless? Or since I already have it use it until I upgrade it?

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[Michael Hoaster]

Sure, why not. Couldn't hurt. And you don't want too powerful a pump. Assuming the unit is functioning properly, dwell time is the most important factor, so pumping water through them quickly is actually detrimental.

Ideally you'd future-proof the setup so that you can easily replace the old with the new.