Interesting Algae Change - The Planted Tank Forum
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post #1 of 4 (permalink) Old 04-26-2019, 04:28 PM Thread Starter
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Question Interesting Algae Change


My 120 gal low tech, heavily planted tank is doing very nicely right now. Please see the pictures.

I'm curious to a change in algae behaviour though. Back in November last year, when I was using my well tap water for changes, the rear of my tank had a brown algae cover. In December, I switched to RO water for changes, increased the number of Ottos in the tank from 2 to 12, and reduced the number of times my auto feeder runs from 3 to 2 times a day. Since then, the brown algae has died off, and is replaced with a bright green type! Any idea what's going on? The pH of the water hasn't changed noticeably.

Thanks for any insight.

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post #2 of 4 (permalink) Old 04-27-2019, 10:03 PM
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Basically I just see the normal settling in and normalization that happens about 6mo in on these type tanks. Without a detailed analysis of well water hard to say what factor is, many more parameters to water besides PH. Reducing organic load by cutting feedings also probably helped a lot. As long as that green algae stays on back glass and not plants your golden. Your well water probably had higher nitrate and phosphate levels.

Add some frogbit or tie up a raft hydrocotyle vine in corner as high metabolism floater and make sure top of tank is well vented and you can probably make last bit of that brown go away. Your hatchet fish will also be much happier with few floating weeds to hide in.
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post #3 of 4 (permalink) Old 04-30-2019, 05:29 AM
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Yeah. I only got brown algae when using tap water with low light. I only got green spot algae, which is hard or impossible to rub off easily when my phosphate or potassium was low relative to my nitrate, with medium light. I couldn't tell you which one it was though due to not being able to measure potassium. I think you have green spot but you can tell by how difficult it is to rub off. Green fuzz is very easy to rub off.
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post #4 of 4 (permalink) Old 05-02-2019, 04:05 AM Thread Starter
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Thank you, both!
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