[Wet Thumb Forum]-one algae after the other - Fertilizing - Aquatic Plant Central

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Old 04-11-2006, 06:25 AM   #1 (permalink)
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I have been getting algaes one after the other, first started with BBA, then some fuzz algae ( still there) and now i get what looks like a green slime, seems like BGA, though not sure

water parameters are :
pH : 6.5
kH : 120 ppm
nitrate : 40
nitrite : 0.25
ammonia : 0
temp : 86-88 (discus tank)
light : two 96 watt 6700k power compacts for a 45 gal tank
fertilizers : Kent grow, sea chem plant tabs and hagen plant spikes, diy yeast co2 injector

not sure where I went wrong, pls enlighten me !!
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Old 04-12-2006, 12:25 AM   #2 (permalink)
 
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are you adding a ph buffer?

how long has the tank been set up im guessing withing 2 months? your nitrates are pretty high, most like to keep them under 20ppm. you should have 0 nitrites, that is what makes me think your tank is still cycleing. if you are running some sort of ph buffer, then you more than likely don't have enough co2. you may possibly need to check po4 also.

hope this helps please write back.
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Old 04-12-2006, 03:36 AM   #3 (permalink)
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po4 is at 1 ppm, how do you keep nitrates down, I do water changes every week and filer changes every week,

sorry for a dumb question but whats a buffer ?
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Old 04-12-2006, 04:16 AM   #4 (permalink)
 
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In a brightly lit tank with high CO2 and adequate fertilization, nitrate is usually so low that extra nitrate has to be added to supply the plants' nitrogen demands. If you have an overcrowded, heavily fed discus tank, then maybe it wouldn't be necessary to add extra nitrate, but the nitrate should not be high.

There are a number of problems in the values that you gave us. At a pH of 6.5 with a KH of 120 ppm, you should have a CO2 concentraton of 72 ppm. 72 ppm CO2 is so high that is is probably lethal to anything that isn't gradually
acclimated to it. Even for animals that are acclimated, it is probably not a healthy condition.

It normally is not possible to maintain 72 ppm of CO2 with yeast CO2.

With 4+ watts per gallon and such high CO2 your plants should be growing like mad and the nutrient demands in your tank should be enormous. If you provide a broad spectrum of nutrients then the plant growth alone should keep nitrate levels down. Under any other conditions, your plants should be sickly from nutrient deficiency.

All-in-all, the algae succession you report sound like a low-CO2 tanks, It reads like either one or more of the numbers you gave us is incorrect or something in your water is forcing the pH low.

Something in the water that forces the pH down is likely to be a buffer. This could be something that you are adding or it could come from something in the tank, such as driftwood or peat.

Do you use tap water in the tank? If so what is the nitrate level in your tap water?


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Old 04-12-2006, 04:31 AM   #5 (permalink)
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err ups, thats not kh 120, its gH 120 ppm

it is an overcrowded tank, i grow cabomba furcata no problem, and seems like all the nymphaea, and baby tears are growing great, but algae run rampant amongs the java moss, aponogetons, dwarf hair grass

my vals are not growing right, they look pale and have crinkled leafs, hemianthus callitricoides are not growing but not dieing either

yes i use tap water and no there is no nitrate in the water

i believe its the driftwood and the ADA aqua soil are the ph droppers
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Old 04-13-2006, 02:07 AM   #6 (permalink)
 
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In that case your CO2 levels are probably low. Overcrowding and relatively high light make the problems worse.

Check the ingredients on your plant tabs and spikes. They may also provide nitrogen which at the momemt you don't seem to need.

Poor color and crinkled leaves in val is an odd symptom. Those are normally symptoms of nutrient deficiencies. A lack of either calcium or boron can cause the crinkling; an imbalance between calcium and magnesium and/or sodium can mimick the symptoms of a calcium shortage. Light color can be caused by a shortage of nitrogen (not likely in your case) or by a shortage in a number of other nutrients, particularly trace metals.

You need to take a look at the fertilizers that you are using. Make sure that your use is consistent with instructions and that the products contain a broad spectrum of nutrients. This is especially important because if you increase your CO2 levels the plants' demand for nutrients will increase sharply and you need to be ready for the increase.


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