Too Much for a 10-Gallon Tank?

I'm no expert by any means but I think with good filtration and water changes, you should be able to squeak by with those fish. I have a 55gallon with an overstock of danio's, tetras and livebearers and use a penguin 330 along with a bio-wheel 60 Pro and do weekly 25% waterchanges. At first I was overfeeding and my nitrates spiked so I did a large waterchange and stopped feeding for 5 days. After that I changed my feeding habits and have not had a week over 10ppm nitrate since and never see nitrite or ammonia. My fish are very happy and don't seem crowded at all. On the otherhand, the danio's are a little more active than most fish and I think they would be happier with the added length of a 20 or 30g tank. If you had more tetras and less danio's, I'd say go for it. Kyle
 
Having danios myself I would say they might be a bit much for a 10 in any real numbers. Its not that they can't be supported but the way these little guys dart around and chase each other I think they'd be much happier in a larger tank like a 20. This especially goes for the long finned variety as when they get full grown they are longer than a standard danio. the tail doesn't affect the bioload but it does have an impact on how crowded your tank looks.

I had four LF Zebras in a 10 for a while. When I transferred that tank to my new 29g I couldn't believe how cramped they had looked in the 10.

Add the three cories but make them small ones. Pandas worked great for me.

Tom
 
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