You shouldn't be keeping your SW in the fridge, as this greatly reduces their life expectancy. Room temperature and you're good to go. Injecting them is easy-- just use something to hold their head against a flat surface, and inject your vitamin concoction. Works like a dream for me.
I would be interested in trying the vitamin trick. However, as an experiment I jammed an aro stick into a superworm and tried feeding it to my aro. It somehow could tell the SW had been messed with and spit the whole thing out. I think I have a very picky fish.
RD, What are you injecting them with? and what type of vitamins? How often is recomended? I used to do this with my turtles and tortoises So i know the benifets but never thought to do it for aro's???
Neat