Right now:
29 gal with 2 AC50 HOB filters
2 comets (med), 4 fancies (2 fantails (med), 2 black moor (1 med, 1 sm)
30% water change once a week, twice if the brown algae builds on the sides faster.
Not sure on Nitrate at the moment.
When I first bought them the LFS said 4-6 would be okay for 29 gallons...They also said Zebra Nerites wouldn't reproduce unless in brackish water (which they did; in non-brackish water, mind you).
I know they're a bit much for 29 gallons, but they will be getting moved to a bigger home shortly. I'll be setting up a 75 gal in the near future. I considered a 40 breeder at one point, but I like the idea of 75 better. I don't know of a better footprint at that price point. I certainly don't have the means to do 100 gallons. Between space and the weight of the aquarium, as much as I'd love to.
Anyway, the 2 comets and 2 fantails have been doing really well so far. I've had them for a few months, water is always quite clear with minor algae. So I heeded the advice of my LFS and added 2 small black moors. One died 1 week later and the LFS replaced it (water tested fine - that was 9 days ago) with a black moor 2x the size (so like 1.5" not including tail). I don't think it's helping that the weather is a bit warm again this week, but at least today should be the warmest day of the week.
I think it would be a good idea to set my 10 gal tank up (sitting empty under the 29) as a sump, but I'm not quite sure how that works so I'm going to find some sites on it.
Thanks for you help.