Cats skeptical of chaeto?

[apeshot]

We have two cats who are obsessed with looking into the sump. I swear they are super skeptical of the chaeto algae ball. lol. Every day they want to peak in the sump, but also don’t love it. Anyone else?

 

[Gumbies R Us]

I have one cat that showed some interest in our tank but not anymore. My orange cat has never once cared to look at the tank