Lost my pair of pearl gourmis recently. No other problems in tank. Parameters are fine and no other deaths. Would love to replace them with another top dwelling fish. Like the pearl gouramis but open to something else. Considering angels but I have a school of tiger barbs. Now my tiger barbs are very docile. Never have nipped any other fish in the tank. Other consideration is marble hatchetfish. Really like how the look and that they hang out on the surface. Any other suggestions?