I'd get a wp25 for both. A fellow reefer tried out a wp40 in his 75, and said the flow was just way too much ... I'll have to check the magnets of wp25 on our display regarding effectiveness on thicker glass .. I have a wp40 on our display and the magnet has been holding well -- I'd imagine it's the same magnet but will double check for you
EDIT: Come to think of it, I know another reefer that has wp40 in this 75 and he is more than happy with it ... if you're planning to keep the MP40, then I'd say go with a wp25, if you're planning to sell the MP40, then you can go with WP40
- Archit
I have a 90, if it's a standard 75 then it's just 4 inches taller. I have a wp40 in my tank and the flow is awesome. I have an Lps/sps tank and the flow is powerful on a 40 but it's necessary if you want that kind of coral IMO