Lynn,
Thats some great advice thank you!! I think i am definitely using too much supplement as you suggest.. I will have a go at flicking some into the back of the tank, just to get the shy chap going - he's normally ok once he has had one or two and he starts properly scrambling around.

Will try the bag technique also, need to get in there with those bugs!! We only have one variety of fruit fly so far, and will be careful to stick with them.

Our guys seem to really enjoy the pin heads, and handy for the shy chap as one or two quickly trundle into the far recesses of the viv, the FFs seem to take longer and stop to 'groom' themselves..

Rory will return later and have some more questions related to your post..

Thanks again, Carly