Refugium for Nanocube

[Drock169]

Do anyone know if there is a refugium available for a Biocube, preferably an in tank one?

Also I recently added some snail, hermits and a xenia and had an ammonia spike of almost 0.2, the nitrites are at 0 and nitrates at 2.5. I'm using 15lbs of life rock, 10 lbs of live sand in a 14g biocube. Just wondering if this is normal and any idea on how long it will take to reach equilibrium again?

Thanks