i put them in a spare komodo tank 30cm by 30cm and 45 cm tall... (its rubbish i dont like this make of tank hence a spare) so i used this for the quarantine tank safe to say its not fly safe luckily my GF left her cup of tea next to it with a little in, just cleaned there tank seen the cup full of fruit flies... hmmm good job she takes sugar i might put another there tomorrow why im at work hahah any tips on this problem catching strays? (this would be for your hat-trick of useful tips/ help btw)