i done a couple vodka dosings whith my scubber. i didnt notice any side effects other than bacteria bloomed like crazy, but i hooked a skimmer up to get rid of it... But after reading about thos who long term dose and stopping, how it can kill your tank.... no thanks.
I wouldnt use bioballs IMO. They eventually create pits in the plastic, more equipment to add to your shopping list later on, requires maintenance if you want them to last longer, and they do the same thing as LR except for the fact that they only breed 1 type of bacteria, the kind that needs oxygen that breaks down ammonia so they cant break down nitrates. Just get some more LR in there and it's take care of both, provided that you can.