04-09-2008, 07:22 PM
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Very few fish are actually "topwater fish". That term is a generality to explain which fish swim where. Imagine lines placed horizontally in your tank defining botom, mid-water , and topwater. Topwater fishes are the ones in the upper 1/3 of the tank. So, like many other terms in the hobby, we are misled into thinking something that isn't.
ABF's, hatchetfish, and arowannas are fish that come to mind when thinking of fish that prefer the most upper reaches of the tank. All are notorious jumpers, so attention must be given to alleviate that problem. Hatchet fish would probably be the fish most likely to fill the bill in your in your scenario. Some killifish would also be a nominee, if you can find them.