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Guinea pig blood in urine?

Hello. One of my guinea pigs, I’m still unsure which (i’ve heald them individually on white towels and still nothing), may be peeing blood. His urine is a murky brown color. They are already on an SMZ suspension for a URI, which would kill any UTI, so what could be the case? I don’t really want to take my guinea pigs to the vets for extreamly costly x-rays (yes, my vet is quite expensive) that could end up showing negative for bladder/kidney stones.
Thanks!
the urine doesn’t seem to be brown all of the time, but it still concerns me.
really? i don’t care about them now? who are you to think of accusing me of this? they’ve been to the vet 3 times this past month with $100 per visit for the both of them. yes, i do care, but my wallet is screaming at me.
and the urine is slowly fading to orange, hinting that it is oxidation.