Where did you get that reference that 130ppm is 'super hard' water? Using tannin to soften water is fine, but if you want to get into details, you must monitor your pH level because as water softens, stability of pH also becomes a problem. Be sure to check your gH as well. Bettas need their minerals. But then again, since they live in tanks that you have to constantly clean, it should be no problem. This is of course, in theory according to what we know. However more, Tannin is used by many betta hobbiest, I have yet to witness any problem with pH fluctuations/spikes that killed bettas. Anyway, I just want to leave you with the notion that bettas are very adaptive and hardy. You will be okay any way you choose to go about it as long as the changes are not drastic and parameters are kept constant. I mean, you can use a RO kit too. That is the real way to soften water IF you had high levels of kH. Does any of this makes sense? It's late and I think I'm ranting now lol.
Last edited by whatsupyall; 06-24-2013 at 04:20 AM.