I have 4 Midas that all will do it on occasion, my Barred male does it always. Put a hand, foot, or face near the glass and he goes nuts. You can hear his teeth scrape the glass. Also have a Huma Huma Trigger that does it which is bad because he is in an acrylic tank. In the past I have had Texas, and Synspilum, and a Blue Gill that did it.





Swordtail is the