Dark green algae on sand - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 19 Old 04-26-2012, 09:07 AM Thread Starter
oh yes i read that thread. I did a quick experiment and put some of the green dot alagein a small plastic container. Left it there above the tank for a few hours then came back to find the alge attached to the sides of the container. Its like it has to be on something. Anyway thanks for the help all.
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post #12 of 19 Old 05-06-2012, 08:25 PM Thread Starter
i tested the water and found the nitrates to be 30ppm while ammonio and nitrite is 0.
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post #13 of 19 Old 05-17-2012, 09:21 AM Thread Starter
well the green algae on the sand and sides of the tnaks still prevail and i noticed that all the stem plants are not growing at all. THe brown crypts and floating are growing ok however. The sand in the tank is simple and has a few seachem root tabs. I do dose the tank with seach flourish comprehensive a day after my weekly 25% water change.

Im thinking maybe a lack of nutrients?that could also be the cause of the green spot algae and cyanobacteria?
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post #14 of 19 Old 05-17-2012, 09:40 AM
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Are you now thinking there is cyanobacteria? If this is it, then it is organics that cause it, period. Light is obviously necessary, but it is organics-related first.

I have battled this a couple times, most recently last month in my 70g. I cleaned the canister filter and it almost went away just from that, but in a couple weeks it began returning and within a week was covering the floating plant roots. I did a thorough substrate vacuum over about 1/2 the tank where I could get to, and by thinning out some chain swords in the process; removed as much by hand from rooted plant leaves as I could. A couple major water changes too. I also reduced the fertilization (stopped it for a week) as in this case it was probably related; I had been doubling the nutrient supplementation in an effort to get my Frogbit growing better, but that was unsuccessful and it most likely contributed to the cyano.

This week it is gone, totally, not a scrap of cyano in the tank.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #15 of 19 Old 05-17-2012, 07:59 PM Thread Starter
Cool

based on your forum, i have concluded that it is cyanobacter or as some call it blue green algae. Im still curious to why my stem plants arent growing at all. The stem plants are water wister, rotala indica and red ludwigia.
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post #16 of 19 Old 05-17-2012, 08:17 PM
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Originally Posted by Blaxicanlatino View Post
based on your forum, i have concluded that it is cyanobacter or as some call it blue green algae. Im still curious to why my stem plants arent growing at all. The stem plants are water wister, rotala indica and red ludwigia.
Having tried some of these myself, I can say they need good light (moderate may not be sufficient), and more nutrients including sufficient "hard water" minerals like calcium, magnesium and potassium. Soft water is often deficient in these. I thought my failings with Wisteria were light-related, but now I realize the GH played a role too.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #17 of 19 Old 05-17-2012, 08:43 PM Thread Starter
ah i see. I do know that my water hardness is high. However i use the same water in my other tanks and have had HUGE successes these. Its only this 55 gal tank that is giving me so much trouble
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post #18 of 19 Old 05-18-2012, 09:31 AM
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ah i see. I do know that my water hardness is high. However i use the same water in my other tanks and have had HUGE successes these. Its only this 55 gal tank that is giving me so much trouble
Something is out of balance in that tank. The challenge is finding what it is.

Just throwing out another suggestion, there is allelopathy, plants release chemicals that sometimes affect certain other plants (sometimes algae too). I've very limited experience in this area, but looking at the combination of plants in this or that tank may show something.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #19 of 19 Old 05-18-2012, 06:10 PM Thread Starter
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Something is out of balance in that tank. The challenge is finding what it is.

Just throwing out another suggestion, there is allelopathy, plants release chemicals that sometimes affect certain other plants (sometimes algae too). I've very limited experience in this area, but looking at the combination of plants in this or that tank may show something.

hmm i think i see what you mean. I have a nudging feeling that it could be also a co2 imbalance. Based on the number of plants, i feel it could also be a lack of co2. I need to test this though.
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