When I set up my gravity feed refuge (mainly for pod production for the mandarin), I used a MaxiJet 600 to pump the water into the refuge. I added some macro algae (racemosa) and lights. Soon, I had LOTS of red slime covering everything. I added a powerhead in the refuge to help keep the water circulating. Now there is a lot less slime algae. From what I have read, it is best for racemosa and chaeto to have enough flow to slowly tumble so all sides of hte algae mass get some light.
This summer we plan on redrilling the refuge to add a second bulkhead or a larger bulkhead to increase the flow.
Just my experience.
Vickie
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