Darn here I thought I had the kats meow!! I will take your word on it since you know from experience. If something happens once it will happen again.
Thank you for sharing your knowledge on using one.

Thanks ADC and KeithC good advice

It takes roughly 10 hours to take 90 gallons of 40 degree water up to 105-110° F with a 1/2 hp sump. I ran the test twice to make sure it was accurate. Almost cost me my marriage since I was experimenting in the basement at the time with very large creek chubs.

Thank you very much for sharing that. I fish mainly with creek chubbs they need a lot of air.

Also depends how many fish your trying to hold, more fish needs more air, with more waste, and more nitrates that a normal biofilter can't handle. The trickle system with overflow works best, a large air pump with the BIG aerator stones works good and is inexpensive.

I used to supply salt water minnows (killies) to bait shops, the trick for the shops to keep them alive is to sell them as fast as possible,

Sump pumps are made to run only intermittently. Pumps that are specifically made for garden ponds run cooler. Garden pond pumps are more expensive.

Keith

Correct. I went to a submersible pond pump and had no heat related issues.