I have a pond so size isn't a problem, they are quite peaceful with the minnows actually and some of the smaller ones swim around with them from time to time. The bigger ones couldn't care less about them to be honest.Those are all tiny, they will grow to at least 6", and potentially up to 12" in body length. They will need a much larger tank in the near future: 4+*2*2 ft for fancy goldfish or 6+*2*2 ft for common goldfish. They live for 15-25+ years if well cared for.8X goldfish (1 tiny (1 inch), 2 medium (1.5 inch), 1 medium/large (approx 1.7 inch), 4 large (2 inch to approx 3.2 inch)
The temperature is also high for common goldfish, and on the upper side of ok for fancy goldfish. And they will eat small minnows.
as for the temp, the tank is diy fan cooled (see this link http
/www.fishforums.net/index.php?/topic/365170-diy-12-volt-brushless-cooling-fan/page__p__3046891__fromsearch__1#entry3046891 ) i am trying to persuade my dad to let me freeze some dechlorinated water so i can float that on the tank to cool it down.







