I'm currently running the 34g Solana. With regards to the back wall, yes it's tough to clean but I see it as once my colonies get established and grow out I wouldn't be able to see the back wall anyways.
I've ran a 75g display with 20g sump before and I don't miss the sump too much. But then again I'm trying to run a KISS system without a skimmer... It's still in its early phase so far so good. I'm really enjoying my Solana fwiw. Best of luck.
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Solana 34g - skimmerless, refugium, MP10, Tunze ATO, retrofited led discoball
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