Try and take all the filter media across if you can. Removing the feeders and putting them in the smaller tank will not do them any good but you need to keep the bio load down in the 75. The 75 will have gathered enough bacteria to cope with the ammonia and nitrite before they get to dangerous levels. If you take all the media over it shouldn't take long. Just make sure when feeding to fully clean up after them. Try not to leave a scrap, so not to add to ammonia levels.
Try not to just dump them in the new tank. Introduce them, the temp won't be exactly the same. The PH may be unless you have driftwood in one of them. A sudden shock of differing temp and PH should be avoided.
I believe the conditions will be less harsh for them in the 75. Got your 90 yet!? Plans for it?
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