Normal
Yes we have some very small slings in those spiderling tubs (on the right in your pic) the ventilation holes in them are perfect for tiny slings... I know some people will disagree with this but I find its easier to provide a better environment for slings in something other than a vial... The choice is yours but that's what I would do.. At least you can provide a tiny water dish (tattoo ink pot or a pill blister washed out well) and you can give it a tiny hide - you can keep a little of the sub around the water dish a bit damp for the sling.. If you are using crickets make sure they are prekilled and remove the following day