01-30-2013, 09:57 AM
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That is sad to hear.
Make sure absolutely nothing is transferred from this tank to any other tank. This means drying your hands between tanks, not using any net, water changer, etc without fully drying, etc. Until all signs are gone, which means a few weeks.
I would track down the metro I mentioned; this is the best way to deal with internal issues. Also, be vigilant on the water, as antibiotics will affect the various good bacteria too. And sometimes plants.
If this was bacterial it likely arrived with the new fish. Quarantine all new fish for at minimum 3 weeks. I never used to, until I lost about a third of my 115g tank to something much like this. I learned my lesson the hard way, as have you.
Still keep a close eye on the loach though, it is not above suspicion; I hope you can find more.