I found a post where someone with the similar looking jellyfish art model took a 7 mesh like the one below:
and then cut it to fit under the flow bar and attach it by placing 4 suction cups and pressing it tight to the back filter.
I tried this and the results were terrible:
this stopped pretty much all flow from the return bar and 2 jellyfish got stuck almost immediately.
Just out of curiosity there is actually a slot that goes behind the filter and I already had the mesh so I cut it to fit into that slot:
So far this has actually worked!!
There is about enough room for 3 pieces of this to fit snug but when I did this the water started overflowing the top into the back chamber and I almost lot a jelly.
After installing this I had to adjust the pump once again and turn it up a little higher but so far it seems to be working!!!
I will keep you all updated with if this works or not.