Algae blooms/lighting questions

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Chaitika

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Feb 1, 2007
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This 30 gallon long has been set up for 2 months. I started the tank with lots of plants, 2 powerglo HO t5 rated at 18K kelvin, and new eco-complete substrate. 10 hour timer cycle with a red sea pro co2 injection kit including the solenoid. The co2 turns off about half an hour before the lights do. I waited until about 3-4 weeks after set up before dosing with flourish. I was dosing with half a cap per week as per the instructions.

Everything was growing like mad but ph was in the 8.5 range. Water from the tap is about 7.6-7.8. I read up on the eco-complete and found that some users experienced the same thing. So I cranked the c02 in order to drop the ph. The ph did not drop much despite the co2 and 50% weekly changes. I had one algae bloom so I turned off the lights for 4 days and turned off the co2. I started up the lights and co2 again but didn't dose with flourish. A few days a bloom started again. I ran a UV sterilizer for 3 days and that cleared up the tank.

I brought the light cycle down to 8 hours hoping that solves the problem but I'm not so sure. I read of guys running 12 hour cycles. Is it the bulbs I'm using? I can't believe it's because of the co2 since co2 is supposed to discourage algae growth or am I wrong on that? Is it because it's a new set up? As I said the plants do great. I recently took out a bunch of micro-chain swords to make room for HC in the front.

I have a dozen threadfin rainbows and a bunch of cherry shrimp and I know i'm not overfeeding so it's not the amount of food I put in.

april12tank1.jpg
 
PH, KH and co2 need to be in proper balance in order for the plants to effectively utilize the co2. Adding excess co2 will not solve your problem. If you are using tap water, you may be overdosing trace elements by adding flourish.
 
Andrewtfw;1700890; said:
PH, KH and co2 need to be in proper balance in order for the plants to effectively utilize the co2. Adding excess co2 will not solve your problem. If you are using tap water, you may be overdosing trace elements by adding flourish.

Not likely, as flourish has very low macro nutrient levels, and the primary in flourish in nitrate, which isn't in tap water in high enough levels anyway.
 
Andrewtfw;1700890;1700890 said:
PH, KH and co2 need to be in proper balance in order for the plants to effectively utilize the co2. Adding excess co2 will not solve your problem. If you are using tap water, you may be overdosing trace elements by adding flourish.
Ditch your bulbs, the 18,000K is not proper for plant growth. Switch to the Lifeglo2 bulbs. To know what your problem is, I need to know what type of algae you encountered.
 
I have some hair algae growth and then there were the blooms of suspended algae.

I'll try the lifeglos. I always did wonder if the 18K bulbs might be too strong.
 
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