The court jester goby ( Koumansetta rainfordi), which has also been called Rainford’s goby or the Old Glory goby, is native to countless tropical coral reefs of the western Pacific Ocean from the Philippines to the southern Great Barrier Reef to Fiji. As far as marine aquarists were concerned, everything about this species really changed when it became available to aquarists as an aquacultured species. However, even amongst its closest relatives, the court jester goby is a real stand-out in any size tank. Quite a few members of the family are already cultured commercially for use as ornamentals. Gobies (Family Gobiidae), being so small and typically amenable to aquarium conditions, are generally a must-have for small marine aquaria. Natural (and captive) history of the Court Jester Goby In light of how few fish species are even barely suitable for these tiny systems, it might be hard to believe that any can truly thrive in them. Given the unique difficulties in maintaining a healthy nano tank, one should put a lot of consideration into any prospective fishes prior to stocking one. Though it might seem counter-intuitive at first, successfully housing fishes in nano tanks can be a serious challenge! A lack of personal space can leave many normally peaceable fish species at each others’ throats. Sharply fluctuating conditions, which are much more common in small systems, can stress the hardiest of fish species. Due to their limited volume, water quality can decline rapidly, often leading to algal plagues. But let’s be honest about one thing: they most definitely are not necessarily easier to operate. And they do indeed cost less to build and stock, something important to those on a strict budget. Yes, it’s cool that nano aquaria can fit on your office desk. To be sure, there are rather few fish species that meet all of the above criteria this small list gets even shorter when the candidate must be (and stay) small enough to fit comfortably within the narrow confines of a so-called nano tank. Then, when keeping (or planning on keeping) small, timid fishes or vulnerable invertebrates, we ask, “but is it peaceful and/or reef-safe?” Over time, we certainly might place a high value on additional characteristics such as sourcing (aquacultured or wild-caught), ecologically beneficial behaviors (grazing unwanted algae), and so on. Of course, one of the first things we look for in an “ornamental” fish species is a pleasing or striking appearance. When it comes to saltwater aquarium (especially those for a reef tank), there are a lot of different attributes to consider.
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