Suggestions for 50g cube?

Buderfly

New member
My husband and I are downsizing from a 125g and considering a 50g rimless cube. I would like to pick just one prime piece of rock (Marco signature figi) with a few passive fish, maybe some firefish or mandarian gobies.
We are planning a refugium and sump in our basement, would I need anything extra to support the gobies? Im fairly new to the technical part of it so please set me striaght if Im heading in the wrong direction. Any suggestions?
 
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