i'll be moving in about 7 months , i'm gonna hav a pond in my new house where the goldfish can live with a few others.
i'm sure he's ok where he is for another 6 months ,don't you?
Infact it would be beter off in the 10g at a shop as it can then be rehomed
i live in the middleeast,where there r very few aquarium hobbyists.
over here 90% of sales at the fish stores are to 10 year olds,who keep 2 or 3 goldfish in a bowl

.
and if the fish arn't sold they are left to die in the parasite infested 10g at stores who barely feed them twice a week.
even though there are some serious hobbyists,they don't buy goldfish due to their
sizes.
most stores here don't treat their water if the fish have diseases and when you walk into these stores you see half the fish in the tanks are dead and the other half dying because they eat the unremoved bodies of their friends

.
i'm not sayin all the stores are bad,some are superb(no dead fish,professional help,no dyed fish,no overstocking) but these stores don't accept fish from people due to disease risks.
now tell me,you still want me to give my fish back to the store?
