i keep 24 comets in a 10 gallon at a time.... fortunately they arent in there for long!!! they turn into snacks. However, goldfish have their good qualities. Your friend should probably put them in an actual tank like 55 gallons for the remaining two. Lets be realistic about the tank size. 2 small deformed goldies in a 55 would flat suck though. If he is going to neglect thier home size he should at least keep the water clean. Go over there one day and say you found them dead and flushed them, but really bring a bag and take them home or to the LFS yourself. If it makes you feel better, a buddy of mine told me a story of when he was younger he had a fair goldfish in a bowl and ran out of food, so he put some dr pepper in there to feed it every day and wound up with brown water and a dead fish.