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Old 04-18-2010, 08:13 AM   #1
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Brown algae then green, is it ok?

My tank started growing some brown algae on the sand and tank walls last week, so I scraped them off while doing a pwc. Now I have green algae on my tank and live rocks, they are ugly! I cleaned the wall again but left the rocks alone to the hermit crabs.

What's causing the algae to grow from brown to green? I tested the water all seem to be normal.

This is a 1 month old tank with fish and coral
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Old 04-18-2010, 09:49 AM   #2
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This is a new tank, it is bound to go through phases like this. Whenever stuff is growing rapidly in the aquarium, it can distort your test readings. There's no bad stuff in the water, because the growing algae is eating it as fast as it is produced; you're still producing lots of it. You have a higher nutrient load than your system can handle right now, the algae is helping it out.

At one month old tank with fish, either those fish are very new or you did your cycle with fish?

You might have cyano rather than true algae.
Cyanobacteria, AKA Red Slime Algae

Either way, I would not worry too much about it, just get on a good feeding/maintenance routine and keep it up. If the algae is still there when the tank is 3 months old, then we might look deeper into it.
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Old 04-20-2010, 03:05 AM   #3
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So i should keep the green algae on the tank wall for now?

i cycled my tank for 2 weeks, since I used ocean water and the tank was actually running before, I decided it should be "ok" after i did the tests.

it began to grow back like in one day after i cleaned the tank, I even did 20% PWC yesterday too.

i'm going to cut back on feeding and the lights... i think my lights are on for way too many hours (12-13 hours)
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Old 04-20-2010, 04:31 AM   #4
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Yeah you can relax. PWC's every week, at least 25%, and a bit less light wouldn't hurt. Maybe around 10 hours? I'd leave the algae as it's soaking up the excess nutrients. They should start to decrease once your tank ages and as they do, so will your algae.
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Old 04-20-2010, 05:24 AM   #5
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that's good to know. they are just annoying the *$&(*!@# out of me because the whole tank wall is covered in green, very unpleasant for viewing..
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Old 04-20-2010, 05:55 AM   #6
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It won't hurt to clean the glass if it bothers you so much. Cut the feeding to everyother day, cut the lights to 8-10 hours and keep harvesting the algae on the glass and then let the algae burn itself out.
Give us some tank readings so we feel better.
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Old 04-21-2010, 05:38 AM   #7
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i did a test yesterday - ammonia 0.25 , nitrate / nitrite = almost zero, can't really tell. ph ~8.0

I just noticed one of my corals is not opening today, it's got algae growing on it... not sure the name of it but here are some cell phone pics. see the rocks are all green...

it used to be on top right corner but i moved it down a little for better flow..




should I be worried?
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Old 04-21-2010, 06:48 AM   #8
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Yes, you should be worried. Your tank is not through with it's cycle yet. You still have an ammonia reading and No real nitrate reading. In a reef tank there is no such thing as "ALMOST". Did the place where you got the coral from say it was Okay to add them to your tank? Wrong. Oh Well, the best thing you can do now is a partial Water change of 15-20% to try and remove as much ammonia as you can as well as nitrites.
The ammonia and nitrites is the reason your corals are not openning today.
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Old 04-21-2010, 07:12 AM   #9
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Also is that an anenome at the bottom of the tank?
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Old 04-21-2010, 07:39 AM   #10
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That's what I thought...I'm hoping it's plastic....lol
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