10-22-2013, 02:38 AM
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Usually mollies purchased full grown are 1 1/2 to 2 years old. Old would be five years or so...it's just so hard to tell when you buy them as adults, he could very well have been several years old. Common life-span is 3-5 years for mollies, but with those panda ones...they're pretty fragile, you never know. My panda lyretails and gold dusts rarely last more than 1-2 years after being purchased as adults. =(
As it stands though, if your tank is tetra safe, it's not healthy for mollies. They have very different water requirements. Tetras need softer water, mollies need very hard water and prefer it to be brackish...if well cared for they can usually live long and healthy lives without the salt, but everything else must be where it needs to be.
I currently have a ceamsicle molly who is nearly six years old. She's starting to go around the bend as well...blind in one eye and scales getting more pale, losing energy. So it's possible yours is just old. I would honestly move him to a cycled QT tank with stats proper for mollies though, sounds as if he may be ill more than old, could be caused by the water stats not being molly-friendly.