180 gph in your sump isn't too much at all, no need to worry about washing your pods away You could probably handle a lot more than that also, if you decide you might want/need to some day
Yeah, I haven't used that pump yet so I didn't know how fast or slow it would be... the one I have running right now doesn't have any information on it so I have no idea what I've been doing in terms of gph, but I plan to start using the one I took the measurements from as soon as I can get some sort of an adapter to connect it to the hose - the hose and the pump have the same size hole.
(Edit: That's rather nice... as soon as I mentioned it, I managed to find an adapter. Pump is running beautifully, even if rather slower than the last one I had on there. )