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Stick the plastic bag in a small box instead of an envelope, that should stop them getting squashed.

Good as far as I know. Is there a way of checking the O2 levels? The spray bar at the back is pointing slightly up so causes surface agitation and my CO2 is only on for the photo period. The drop checker only goes to lime green never to yellow, so I'm not overdosing CO2.

thanks guys, yeah I already have a cover glass, it's a fluval ebi so it comes with one. Though it actually has a small gap (5mm) all the way round for wires, airlines etc to go into the tank. Which is how I think the little fella got out. I've reduced the water level now so hopefully I wont...

Thanks radik, water conditions are good (what I can test for anyway). Water level could certainly be the issue. The spray bar at the back does tend to push the water quite high at the front. I will lower it a bit and hopefully that will be the last of it.

:( I've just got home from work only to find one of my CRS curled up dead on the top of the table in front of the tank. She must have climbed over the edge of the tank and fell off. I'm really sad now :(