We do not feel that the VorTech pump is a danger to healthy fish. However, just like any pump there is an opportunity for fish to get stuck to it, especially when you're pumping 3,000 gph.
However I agree with some of your sentiment and I am sorry for the delay in putting these foam covers on the shelf. Therefore anyone who emails me today with their address will receive a free foam cover for each of their pumps via USPS first class mail. Honestly, I should have done this from the beginning for those of you who had a problem with a fish and are now nervous. I apologize for not being on top of this.
For those of you who have contacted me already, I will refund your money unless you want to order spares.
-Tim