06-17-2011, 04:21 PM
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Originally Posted by Ami
Hmmm...the pH of the water here is actually around 8. Do you think cardinals or neons would be OK? I was thinking of setting up the 55 gallon with 15 cardinals, 5 corycats and 3 black mollies.
No, I would not attempt cardinals in that. I would assume the hardness is also high, pH corresponds to hardness so more mineral hardness generally shows up in high pH. And cardinals being wild caught from streams with no measurable hardness and a pH of 4-5 will not last in hard water.
Livebearers will be fine, right at home. Molly are of course livebearers, as are guppy, endlers livebearer, swordtail, platy. And there are various other smallish to medium fish that also manage very well in such water. The rainbowfish come to mind, though they are also "swimmers" so the tank length is more of an issue. But Celestial Pearl Danio, Emerald Dwarf Rasbora, and some other Cyprinids like medium hard water.
Corys are largely soft water fish, but the more commonly-available species are tank raised and have been for many decades and thus adapted to medium hard water. Corydoras paleatus, Corydoras aeneus, and several others including varieties of these are tank raised. The rarer wild-caught species would not manage though. We have fish profiles, most all of what I've mentioned are included. Click on the shaded names to see that profile, or use the second tab from the left in the blue bar across the top to go to the profile section.