Brown algae in Ca reactor

[Oli]

Hi there,

I've got a little problem with my Ca reactor. It is an aquamedic 5000 (the big one) filled with ARM. The pH is set on 6.4 with a sera controler and a tunze electrode. Since I use it, it has always wear a brown film inside. When I wasn't under zeovit, I just tought it was the CO2 promoting algae growth, but now my tank is under zeovit since 6 month (PO4 and NO3 not detectable with colorimetric tests) and the algae are still here. So I tested the effluent for the PO4 (salifert test), and it shows nothing.The only explaination I see, is that the ARM is leaking very few amounts of PO4; just below the detection level.
Do you think this very small amount of PO4 (undetectable) can promote algae growth? By the way, my tank has algae growth on the glass, just like before zeo, even with litle doses of start and food. Do you think the small amount of PO4 leaking from the reactor can explain this fact?
The results with the zeo are good, but if my corals became very light, the colors are not that amazing. And there is still some of it that remain desesperately brown . Do you think this can be explained by the probable leak of phosphates from my reactor?


Thanks

Oli

[fkadir]

Its possible that the media is leaking minute amounts of PO4. You can counter it my dripping the CR effluent thru an anti-PO4 media like Rowaphos or similar before it reaches your tank water.