I cannot comment on the options but I believe there needs to be this improvement.
I assume gravity feeds the main tank from the refugium which will contain lots of pods etc. for your fish and coral to eat.
The pipe fro the refugium should extend all the way to the bottom of the main tank and a bit in the sand.
If not smart fish will simply wait and eat the pods as they enter the aquarium but you want the pods etc. to also get into and multiply in the live rock as wll
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