Hi Bro, welcome to marine.
Any size is possible so long you are diligent in the maintenance.
As you should know from your previous experience, small tank is subjected to larger water parameter fluctuations, eg. temp.
Marine will have the salinity fluctuations too due to evaporation if you are using fan to cool the water.
Chiller is recommended if keeping corals. Not a must for FOWLR.
Frequent water change is the key..
I would say, skimmer is a must.
So far not many ready made marine tanks, except for RedSea RSM version or JBJ tanks.
But you will be limited by the equipments if you want to upgrade in future.
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