I was also thinking of doing an opaque solid panel down the middle. The reason for dividing it is t keep from mixing species ... I may turn the forty into an angel tank and get a 30 for each the axolotl and the ADF's

Would a 50 gal HOB filter be ok for two ACF?
And a thirty in tank with the intake covered so it cant harm gills be ok for the axolotl?
We'll have to see what space and finances allow me.