That made mudskippers look cute!!! Absolutely adorable in your video! And GREAT WORK on your DIY hardscape. Coming from a natural aquarium background, it is to me totally magical how well you've made that tree root look!
This particular species (Periophthalmodon septemradiatus) has blue eyes.
Someone mentioned a while ago that his skippies have bright red hue in the eyes. He didn't specify the species.
Most of the pics of mudskippers seem to show no other color than black in the eyes...