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IME glosso quite likes a decent current. This may, of course, be because it simply delivers the CO2 and ferts to the glosso that it requires rather than it being a necessity in itself.

I have over 10 times the tank's volume turnover per hour though as standard!
 

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10 times? Wow! Are there any plants being uprooted due to your very strong current?
I know some guys who use 20-30 times on some smaller tanks! 10 times the manufacturers rating isn't that much really as most turnovers quoted are measured with no media and tiny lengths of pipework, if any. I also use a Koralia pump to help move the water around and they have huge trunovers but at low velocity so it's not like the 'jetting' flow from a normal powerhead or filter.
 
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