I could transport the fish in a 5-gal bucket with only 2-gal water in it. Plenty of sloshing room. And inside a styrofoam cooler base with ice packs around.
Golf balls are really small. Go for baseball-softball sized. You will pay more but it's worth it. Great start!
Smaller tanks have less space for filters. Canister would probably be a good bet, though i do not trust them.
Warmer water depletes oxygen quickly, as i saw with the 88* temps that killed my salt tank. Is there an option for you to use buckets with lid w/holes
I had 4 false Juliis in my 30g. I lost one a month until I was down to the lone ranger, who runs my 100g like a boss. Bad genetics will out in most cases