there is more to this problem. have reposted my answer from rec. gf
http://www.mu.edu/~buxtoni/puregold/...AVITY%20FILTER
here is a cheap filter I used for indoor tanks for sick koi. kept em inside in the
basement all year. Ingrid

"Tom Puskar" wrote:

I'm new to this group so apologies in advance if this has been discussed.

I have a 300 gallon indoor pond (started off as a winter haven for my
outdoor pond fish) and I'm having a lot of trouble with ammonia levels. The
pond is probably overstocked with goldfish but they all look healthy. I get
ammonia numbers off the chart using a standard test kit.

I can provide construction details including filter type but it would make a
long post. I'll be glad to do it offline.

Anyone else have an indoor pond? Is there a newsgroup somewhere that
focuses on indoor ponds?

Thanks to anyone who replies.



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