Cheatomorpha into RSM250 sump?

Hi there,
As some of you knows, I don't use skimmer in my RSM250 as per tons of reasons... But Im facing some difficulties to keep PO4 and NO3 in lower levels.

Im currently using bio digest and bioptim from Prodibio.

Here in Brazil there are tons of people using Chaetomorpha reactors in their sumps.
Its cylindric chamber with led light inside and I could see some good results (chaetos growing faster and PO4 and NO3 levels going down, closer to 0).

I would like to know if some of you guys already tried a different reactor format as a box to fit inside RSM250 sump. I tried to use chaeto into InTank media basket but the light passed through the dark glass and its not even closer to be ok with that.

I created this post to see if someone of you already tried and what is the experience to share with me and Im going to post some of ideas that I could found on Google images too.

Thank you and hope to bring some good ideas to everyone in the club!
 
Here is an idea from a guy called Takalosh - Dario Serretta.

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Source: https://www.marineaquariumsa.com/threads/toks-red-sea-max-250.35691/page-7
 
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