I have 2 xf 230s in my 4 foot 55g. I've had them for ~9 months? I love them, as do my anemones. I love them so much that I'm about to order 2 xf250s for the 60x30x24 I just put a deposit on.
Only advice I have is to clean them periodically.. Otherwise there's a noticeable loss of water movement and noise.
Only advice I have is to clean them periodically.. Otherwise there's a noticeable loss of water movement and noise.