I want to get a wrasse but given that they are known for jumping out of tanks. What exactly is meant by a tight lid? My 55g has a glass lid but there are a couple small (aprox 1/2 inch) gaps where cords come out of the tank. Is this sufficient? If not how can I modify it? The waterline in the tank is 4-5 inches below the top, will the fish even be able to jump that far?