I'm leaning toward stocking my new 40g tank with fancy goldfish. The one piece of equipment that I have from my previous aquarium experience is a powerhead filter that does about 170 gal/hr. That would give me a little over 4x turnover. I know that goldies create a lot of waste and someone suggested a 5-6 times turnover rate for the increased waste. Would I be over filtering if I put a second similar size powerhead in my 40g tank?

Thanks in advance for opinions.

Buck

overfiltering is not a bad thing, on my tanks my filters are rated 5-8 times for what they are i think its a good thing really not a bad thing just keeps water cleaner

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What happens if you get scared half to death, twice?

More GPH are good for goldfish, I still wouldn't try keeping more than two in a 40 gal though.

I second snail's posting - two is a lot of goldfish in a 40. they can grow, and should live very long lives.