Ok, update time.

Yoshi, the Male Betta with popeye, has been moved to the quarantine/hospital tank (tank3) after a 99% water change. Couldn't do bottled water unfortunately.

The agressive female that turned out to be a male is now in my main tank. This might be a problem if it stays as aggro as it was in my other tank but looks ok so far.

I will ad a pic to my gallery now of Yoshi in his new location showing his freaky eye.

Thanks so much for the help.
Are there other problems that popeye is a symptom of as my water quality is always good? I test every few weeks.

Looking forward to your replies!

Bis