I bought this used aquarium and lately I’ve noticed it has a ton of surface scum. It looks to me like the original intake piece (grate) was removed... picture attached. Despite several thorough attempts to find a replacement part, I’ve had no success.
Additionally I was looking into the intank surface skimmer, but they said if the intake is raised intake it won’t work. (Also uncertain dimensions would work)
Does anyone have suggestion on how to fix this, including any DIY projects?

Additionally I was looking into the intank surface skimmer, but they said if the intake is raised intake it won’t work. (Also uncertain dimensions would work)
Does anyone have suggestion on how to fix this, including any DIY projects?




