Hi Bro, this is a interesting setup!
Just to contribute a new points that came to my minds:
1. I'm afraid that your cover will get rusty after a while... maybe you can consider the plastic mesh available at the Daiso's gardening section...
2. Hang over filter may need to be maintain regularly, so you might need to remove it often...

3. The gap between the tree cork bark and the filter.... I can foresee your newts hiding inside and hopefully not got suck by the filter...

4. I made the mistake of having too little water area in my previous setup, that's why my setup is now 90% water... found out thru the hard way that in our hot climate, my newts are doing better when they spent more time in the water... and therefore it is important to keep good quality water and more water volume really helps!
5. Have fun!

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