Originally Posted by Bluewind
I was thinking 2 more Juliis and 2 more neons. It will make them both happier even though they will be slightly below ideal. What do you think?
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I'm think more of the physical space for the fish species, rather than water quality which you can manage to some extent with water changes and plants. But the space is finite.
The corys don't care much about space, they just poke around all over the tank. And given their social structure, the more the better. I have a couple species with only 2 or 3 of the species, but they are in a tank with over 30 corys, so this is less of an issue. Five is the minimum number of corys in a tank, when that is possible. So here I am suggesting 3 more to make 4.
The neons now are a different issue entirely. They need physical space, but being fairly sedate fish (not active swimmers as say rummy's are) they can be pushed a bit further than some species. Remember, they grow--if they are in a suitable environment with sufficient space--to about 1.5 inches.
Assuming they are small now, and if you were to get a larger tank within a few months, getting 7-8 now would be fine. But if the 10g is going to be their permanent and final home, I would up the group to 5.
I think that is about the best I can explain my rationale.