I've got a 60litre juwell tank and until recently had two clown loach, a 
swordtail and a single neon .. the other night, the fateful night, one clown 
loach escaped and was returned to the tank but was gone in the morning. At 
some point the neon had escaped too ... never to be returned. So, anyway, 
quite an empty tank so I bought a couple more clown loach to keep the larger 
one company. He seems to have gone insance, constantly swimming up and down 
in the corner of the tank. Not a slow swim, but shoots up and down. I 
wouldn't want it to be in distress, so am wondering what action I could 
consider taking.

A little history, my tank has been maintained 'okay', although has had a 
tendency to green up. I was using the wrong tool to clean the gravel, which 
I have now replaced and am slowly improving that situation, and my pump had 
lost some of its effectiveness. But it's all generally good now with a good 
scrub of the rocks and glass. Just a little concerned for the mental welfare 
of my single loach.

Thanks