If he doesn't have the skink, then I'm not sure he even needs the sump. The research I briefly did shows the fish water being pumped directly up to the aquaponics tank and that providing the only filtration. Though depending on the method used there may be a need for at least a cannister filter.

I'd have to agree with DC. Putting any land based animal into the loop has the potential for bacterial growth to find its way to the food and would be virtually impossible to detect until you are at the ER with sepsis.

Mechanically, it can be done...but is it worth it? Seems you could safely do fish and plants and keep the skink separate.

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