Not sure which one it belonged to

Now I know this is a sign of dehydration and this is the 1st one I've ever seen although hubby now tells me he found one last week but had no idea what it was

They are bathed daily for as long as they are willing to stay in there, have water in their enclosure, they normally walk under the water when we spray soil and they're food is always run under the tap before feeding.
So my problem is I don't really know what else I could do

Is this ok and how often should it be fed?
Any advice will be much appreciated

Many thanks x