-Harlequin-rasbora water flow

[Shrek]

Running a 40 gallon breeder tank with a fluvsl207 and a tidal55 job and a maxi jet 600. Not sure if the water movement is too much for #Harlequins-rasboras e with the maxi jet pump

 

[bgarthe]

My shoal of 15 in a 33g long get a gentle flow at one end and a calmer zone at the other. They go back and forth seeming to enjoy both. I would aim for a gentle flow and not too turbulence with perhaps a quiet spot available to them.

 

[Mudminnow]

I'm not sure what kind of flow you have with your equipment Shrek, but I agree with bgarthe. I've found my harlequins seem to like gentle flow the best.

 

[fishthatfit]

Going by rated numbers, the 207 is about 200 gph, the Tidal 55 about 250 and a Maxi-Jet 600 about 160. That's over 600 gph on a 40, roughly 15x turnover before the canister media slows it down. Without the Maxi-Jet it's closer to 11x, which harlequins handle fine. I'd pull the powerhead first and see if they start using the whole tank.

 

[Caliban]

I keep mine in a high flow environment and they do fine. They seem to like to hang out in the flow, even though they can go places where the flow is lower.