i was wondering if anyone had any experience with either the pantair or the hydor in line heaters, i was originaly thinking about plumbing the hydor in with my fx5 and one on my 305 because im going to use pvc but then i found the pantair and i like how it has slip fit fittings also ive herd that inline are more efficiant so im not sure as to how many to get i was thinking 2 300 watts would i only need one or get two, also this is going onto a 180g