Yes, if you have only an "antquarium" its bad for the ants, because they can no bring the wask out. Many people don't like this "toy formicarium".
But if you want used, than make an extern container on the "antquarium".
Better is a Formicarium with normally ground.
In Germany it's illigal to give pets outside free (garden). I don' t know how is the law in UK.
Greetings Martin
