after reading this thread i just injected some lemon juice into the 3 that are visible in my tank and they certainly didn't like it. I used a pipette and got it directly down their throat before they could close up.
We'll see if its a permanent fix but for now it's clear that they really disliked that lemon juice.
Well, does it works?
__________________ Wow! That's Crazy! Why would you spend that much and go through all that trouble?