Wow, that’s sad to hear. I figured this would be one of the harder ones to get caught in since the sides are totally enclosed and the back so close to the glass.... sorry for your loss...
I lost a Canary Blenny tonight which got sucked in the rear and mangled by the blade and really don't understand why Ai doesn't offer foam guards like their sister company does for the Vortech pumps!
I designed this guard after seeing reports of fish death and damage. I can print these in Reef Safe black ABS. Shipping from Canada is a bit expensive but ideally it's $20 USD for one shipped to the US, and $5 USD for each additional guard. PM me if you are interested!