Hi fischkringli,
You may only be 14 but you're the wise one here, thank you for the encouragement

I'm 43 but young at catfish
I'm trying the floating plastic box that sits just inside the tank at the top. I scraped them off with a razor blade and put them in with an airstone. I still don't know if they are fertilized or not. They are light colour with a darker colour inside. I have some bb shrimp eggs if I need them. Also I can buy some live tiny foods if any eggs hatch. My fish store always has a tank of tiny live foods going.
I looked up the Chlamydogobius eremius and Mugilogobius adeia. What sweet creatures they are! Good for you. My only experience with fish babies is Sailfin Mollies and Zebra Danios. They breed very easy by themselfves, no help from me
I think I should be able to tell tomorrow if the eggs were fertilized or not. The male is so small compared to the female, I don't know if he's old enough?? He's about 3cm and the three female are 5cm. I put a bit of anti-fungus in the tank to try to keep the eggs healthy.
I'll post again tomorrow when I can get some better pictures of the eggs. Maybe someone will be able to tell if they are fertile.
Racing, shoes and fish. Nothing else matters. Oh, and bacon.