Yup a cover is a must for both of these fish without exception. The bluespots usually hide for a while before they let you see them. Unless it's dried up on the floor or lost in the overflow, it's still in the tank somewhere; I don't advise going to look for him. That wuold just freak it out more and might even injure it. Did you make an artificial burrow for the bluespot? Apparently if you do that, they will make less sandstorms during their bouts of construction.
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