Hi Ken,
I love finding galaxies and have seen quite a few from my location, which is outer suburban with moderate light pollution. Admittedly, using the 12" helps matters but an 8" should also be fine.
I find that using the correct eyepiece is very helpful. I started out using things like the Nagler 22 and 17. I now use the 9 and 12mm. The increased magnification brings better contrast. Many galaxy cores have a high surface brightness and using higher magnification helps pick out the smaller galaxies from the starry background.
I have the O-III filter and UHC also but don't use them on galaxies as they don't help, rather they dim starlight. They work fine on nebulae. The O-III is great on planetaries.
Cheers, Paul.
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