a 1ft cube should be ok for an apisto pair. i've heard that candidi are especially aggressive after breeding though, so you may want to take that into consideration and look at the other species you like instead.
investment wise, how trustworthy are your colleagues and your office cleaner? If it's possible that somehow some contaminants might get into your tank, i recommend a lower cost fish such as viejita/macmasteri. some good specimens can be found at c328.
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