if space is an issue and you can't fit a sump into the design then why not go skimmerless just a 25% wc every week will be fine seeing that you only have softies it shouldn't be a problem, although the problem I see is surface gunk when I had a tank without sump the top surface of water was always chalky white I tried everything to rid it but with no success!
If I were you I would do a hang on over flow with a sump on the side of your tank. I would build a shelf/cabinet just to the side of the tank and fit a 33g sump that way the sump is concealed and you can put some stuff on the shelf like a tv or some flowers whatever....
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Always looking for the next best coral...
90g starphire cube/400mhRadium20k/2 XHO/2x27w UV/2x39w T5/ 3 Trulumen led strips
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