10-13-2009, 01:51 PM
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Originally Posted by Calmwaters
Thanks Byron. There are Rasboras, Swordtails, Neons, Playts, Cory Cats, Mystery Snails, and female Bettas in this tank. I can not remember the name of the rock I have but I can call the LFS and they can tell me if you think I might should put some into the filter media.
The platys and swordtails prefer (and do better in) water slightly basic (alkaline), pH in the range of 7.2 to 7.6. The other fish will be happier in slightly acidic water, pH mid-to high 6's. But they can probably adjust to a slightly basic pH if it is done over several days. And using one of the calcareous rock gravels is the safest way in my view.
Dolomite gravel is not expensive, and a very small bag will last years. I would get it, and put maybe two tablespoons in a nylon bag in the filter so the water can flow through it. Monitor the ph and if after 10 days or so it is not high enough add another spoon of dolomite. It doesn't take much, and once it starts to act it will act, so go slow. Gravel is better because the smaller pieces will release calcium more effectively.
The above is if you decide to continue with the same fish in the one tank. To be honest, if it were me, I would not keep livebearers with the other fish simply due to the differing water preferences. Both groups will be better, which means healthier, if they are in their preferred water conditions.