hehe ... Varban
I looking on your picture and I see ... you keeping Messor (barbarus ?)
all Myrmecinae species drinking VERY slowly - so it is always better to get some small mellow insect (food and water inside) ... in my experience it is about 10mins like you wrote
all Formicinae species drinking faster ,or VERY fast. So ,this feeding system is for this ant category. In my experience ,for example ,Camponotus worker small is full to <1 minute.
Thanks for using this system I think it is the best ,but also better is getting it out from tube/nest ,when is queen/ants full of food ,because they could to move it on bad place in tube eee or they could make mistake and get brood into
Greetings
Skippy