Rainfords needs a very well established sand bed - as it's a filter feeder.
Red heads are quite happy in aquariums smaller than a 5.5 - good choice.
If the tanks mature enough, a blue striped pipefish is an option - stay small but they are pod eaters - so you've got to be well established with a good pod population - or be willing to feed live baby brine.
More than a few 5.5/7s have been done with a single ocelaris clown. Usually as the sole inhabitant.
Andy
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