Wet dry filter

I just picked up a used tank and it came with a prefab sump.Its going to be a FOWLR tank so I am going to keep the wet dry trickle/bioball set-up.
My problem is Im not sure if I have it set up properly.The center chamber is the area in question.There is a drip plate and bio balls.The bio balls are sitting atop an egg crate piece.It looks like there needs to be another piece of acrylic or maybe that is just for user preference.

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I did a freshwater leak test ( had to test the durso I had to build ) ,when the tank is full the bioballs were floating right up under the drip plate,there was no "dry" bio balls.(The black tape is the water line).Also I was thinking I needed to put a piece of filter pad somewhere in that area.

Thanks for reading and helping if you can

 

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Sad to see such a bad implementation of bioballs. These balls should be above water, as a wet filter is much the same as any other rock stone or place for bacteria to grow.
Bioballs are the best at what they actually does.

Cons from my point of view, space is for me not an issue.
It collects detritus! And has no larger life to clean this out, and things are broken down to the basic circuits releasing any building block within.
Famous name of this is nitrate factory.
Alas... Leads me to the need of pre filtering if this is run in a serious big scale.

Pros.
This is breaking down substances without the use of oxygen in the water > thing is... These living bacteria is breaking down toxins faster than anything else we know of without putting back just as bad byproducts. Ie O3 and bromides.

It oxinates and oxidizes water with the tradeoff being space and pump capacity and air quality around the bioballs (room) much the same as skimmer. But a half sized medium crap pump with no attention to giving it a real chance is giving this equipment a bad reputation. Do it half hearted and it will give you the same back.

I regretted big time I gave up mine. Will have to implement again on the new tank