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Discussion Starter · #1 ·
Hello Everyone

Can you help me? I am very grateful for your resonses
In my Walstad tank I am running into trouble with steady algae growth that slowly overwhelms many of the plants. Plant growth is fairly slow and has been for a long time


The algae is attached, mostly ½” long and olive green. The tank is 2.5 years old and just a year ago I added a bunch of fast growing plants to try to discourage the algae. While the new plants initially did fairly well, now, almost a year later, they are dwindling .

The tank is 33 gals and is 12 inches deep. It has two TMC Gro-beam 600s for light. (too much light?) The lights are on a timer (6 hrs on, 4 off, 6 on) There is a soil layer capped with gravel. I have been running UV contiuously for disease prevention. An small internal pump and filter provide flow to the UV. I remove duckweed every 7-10 days.
The tank is lightly stocked ( 2 bronze cordoras,4 brilliant rasboras, 1 cherry barb, 2 dwarf gourami) . The water tests out at KH 7, GH 11, Nitrite 0, Nitrate 0, Ammonia 0, pH (high) 7.6 . I do a 30% water change every 8 weeks of so.

I have been using Seachem’s Equilibrium for GH and I know there is a danger of hydrogen sulfide in that. I probed the soil layer with a skinny stick and in 15 “pokes” released a few bubbles in 3 locations. I am currently organizing to use Ms Walstad’s recipe for maintaining GH.

Can UV treatment cause trouble like this? Or too much light? Or presence of hydrogen sulfide in soil layer?

Fall is here and I should order some more plants before it is too cold to do so. But before I do, I sure could use help figuring out what is wrong.

Many, many thanks
Plant Rectangle Wood Bottle Grass
Plant Terrestrial plant Sunlight Natural landscape Wood
 

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Discussion Starter · #4 ·
Thank you for your suggestions. And they are easy to implement, which is great!
I am still wondering I have too much light but i do not know the rules of thumb for LED lighting. The specifications for the lights are 12 watts, 1029 lumens and PAR 61 at 400 mm in air per unit. I am running two units. The tank is 12 inches deep.
 

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Discussion Starter · #6 ·
Thank you Mr. Green. I have reduced the lighting somewhat by adding a layer of black window screen .

Is there anyway to determine whether using Equilibrium has ruined the substrate?. i tried to determine if there is alot of hydrogen sulfide gas in the substrate by poking it 15 times with thin stick. Doing so produced 2-3 bubbles in 3 locations. Doesn't seem like alot but maybe my method is useless.
If I need to tear the tank down and start with a new substrate, I need to do it soon, before it gets too cold in Maine to ship plants.
 
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