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Old 02/15/2006, 06:44 PM
CincyGida CincyGida is offline
Registered Member
Join Date: Sep 2004
Location: Cincinnati, Ohio
Posts: 98
Better lights, new problems

I have a 40 gal reef tank and just went from 40 w to 120 w and within days the amount of new growth was staggering.

Unfortunately, I'm getting a ton of brown and purple as well. Here are some pics:

Is there an additive that I can put into the water or should I do water changes every week? I've never had this much wattage before so i don't know what to do to help keep a cleaner tank.

Old 02/15/2006, 06:51 PM
NbMaxx13 NbMaxx13 is offline
Join Date: Dec 2005
Location: Roanoke Va.
Posts: 669
I am going through the same problem ... went from pc's to halides and now struggling w/ the algae and experiencing better growth ... So i've been stepping up w/ the water changes and also increased the flow ..... good luck
Eric + Candace
Old 02/15/2006, 09:20 PM
steve the plumb steve the plumb is offline
I am a super nose picker
Join Date: Apr 2005
Location: Montreal, Canada
Posts: 3,461
have you mesured for p.Check what level you are at
silicone can be deadly!
Old 02/16/2006, 08:24 AM
Universal Universal is offline
Registered Member
Join Date: Oct 2003
Location: Australia
Posts: 101
I did have that problem when I upgraded to metal halides.

I just removed as much algae as I can , cut down the light times, reduce feeding and do regualr water changes.

Adding some snails will help alittle as well , the more snails the better.

Hope everything gets better , I'm sure it will just takes some time

Good luck

happy fish = happy reefer
Old 02/16/2006, 09:07 AM
Randy Holmes-Farley Randy Holmes-Farley is offline
Reef Chemist
Join Date: Apr 2001
Location: Arlington, Massachusetts
Posts: 52,068
The red/purple growth on the sand is cyanobacteria. The ways to decrease them include reduced nutrients (nitrate and especially phosphate), reduced organics (skimming, carbon, ozone), and more water flow.

These articles may help:

Phosphorus: Algae’s Best Friend

Nitrate in the Reef Aquarium

Iron Oxide Hydroxide (GFO) Phosphate Binders

Organic Compounds in the Reef Aquarium
Randy Holmes-Farley

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