Yes, a 55g will work as a rearing tank although it can fit at least 3-4 adult fancy goldfish in the end. Don't crowd them too much. If I were you, raise about 4-5 goldfish only. It may seem very few but given the space and time, you will be able to grow your fish well enough without ending up stunting them.xD alright so my plans are in stone, I'll be buying some little Orandas, Ryukin and possibly a lionhead or two. Along with my current Ryukin who has been named Munchie xD
My question though is it alright for me to buy them now if they are about a inch long and put them in my 55 gal.? I'll be getting the new 75 gal in late september early october.