I just received this little internal filter from Amazon. I ordered it because I liked the design that included the spray bar. I usually wrap a thin layer of foam over the intake slits of internal filters in my shrimp tanks, but this filter seems different in that the internal block of foam is right up against the intake slits. If you zoom in on the picture on Amazon, you will see what I mean. Do you think this would be safe for shrimplets without the foam wrapped around the outside of the filter?