Originally Posted by rav
thanks for the link-
we have 6 in the tank and the are about an 1 1/2 avg. long.
they have been in there for 8 months.
Ok, I just want to let you know about their proper care.
Goldfish are messy creatures. They produce a lot of waste (poop) and high amounts of ammonia (fish poison to put it simply). Fancy goldfish (like moors, orandas, etc) require 20g for the first fish and 10g for each fish after that. So if you have 6 fancy goldfish they require a 70g tank to be able to swim freely and grow to their proper size avoiding stunting (can cause deformities and premature death). Common, comet (including feeder goldfish) and koi fish are pond fish. They can grow up to 2 feet in length when kept in the proper conditions.
Filtration is important with goldies. With common tropicals you can get away with a filter turning over the tanks water twice an hour. With goldfish they require a filter that can filter 10x the tanks volume an hour. So a 70g tanks needs a filter that filters 700g an hour.
Hope this helps!