Why Are My Plant's Dying??? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 07-10-2005, 11:21 PM Thread Starter
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Why Are My Plant's Dying???

hi everyone, I'm sorry for posting so many questions but im at a dead end. I have a 75 gallon tank, and all my plants are currently dying. Originaly, I thought that the plants were dying from lack of c02, but I was informed otherwise. People have been telling me that my plants wont dye from lack of c02, and that I must have some other problems with my water.

here is what I do...

75 gallon tank, with 1 arrowana. It is lightly planted, with about 5 plants (that are all dying) I have 130 watts of light that I leave on 10 hours a day.
When I first got my plants, they started to grow very well. Then I had an algy bloom, and I started dooing 20% water changes every day. Someone told me that if I have too much light and not enough nitrates, that could be the reason for my plants death. I don't use any sub-strate, just gravil. Also, I've only been using very little fertilizer "pottasium and iron supplement" (so the algy bloom wont come back). I live in Vancouver, British Columbia, and the water here is VERY soft and acidic.

I'm fairly new to the whole aquadic plant thing. If anyone has any sujjestions, please let me know..

thanks again..
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post #2 of 6 (permalink) Old 07-10-2005, 11:43 PM
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in the other post I mentioned your low WPG. that could easily be what it is.

Just noticed you are an Arowana owner I have a 12" Black Arowana in my 180g.

What plans do you have as far as upgrading tank size in the future? They get pretty stink'n big! My old Silver was 27" after the first year.

Any pics??

Cliff
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post #3 of 6 (permalink) Old 07-11-2005, 12:04 AM Thread Starter
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hay there spar. Glad to see another arowana lover here. I would like nothing more than to purchase a black arowana. currently, my 13 inch sliver arowana is living in my 75 gallon tank. Yes, the same tank that all the plants are dying in. I don't plant to get any bigger tanks any time soon, but eventually I'm gonna get a 200 gallon tank that will be devoted to freshwater sting rays, and arowana's. Before I get any further into the fish game, I want to fined out why the hell I can't grow fresh water plants? A beautifull, planted, freshwater tank can rival any "reef" tank in beauty, but the problem is my plants keep dying..

ps.. what does WPG stand for??? I'm thinking it means "wattage per gallon" but im not sure. i have roughly 2 watts per gallon, and all my plants have low light requirments. The people at my local fish store said it would be sufficient, but my plants are still dying.

I researched into wattage for a 75 gallon tank, and I found that even 0.5 watts per gallon would be enough to keep my plants alive. The optimal range for small tanks is 4 watts per gallon, (id you have plants that require lots of light). The bigger the tank the lett watts per gallon it need, or so Ive been told. I was told that a 75 gallon tank could grow low light plant with only 0.5 watts per gallon.
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post #4 of 6 (permalink) Old 07-11-2005, 12:28 AM
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yep, wpg is watts per gallon.

maybe bumping the hours per day up would help though. I'd do at least 12 hours with that amount.

the nutrients necessary for planted tanks are:

Phosphates (PO4)
Nitrates (NO3)
Traces (lots of stuff in it, including iron (Fe))
Magnesium (Mg)
Calcium (Ca)
Potassium (K)

PO4 - need in a range of 1-2ppm. Testkits are reasonably priced. Can dose with KH2PO4

NO3 - need around 20ppm. a little higher wont hurt. Testkits are a must.

Traces - need to dose about 5ml per 20g's (20ml for you) 3x per week. Can either use Seachem Flourish ($$ adds up though) or CSM+B

Mg - tap water generally has enough of this, but I find it good to give a "booster". Just add about 1t of Epsom Salt (MgSO4) after each 50% or so water change.

Ca - tap water generally has enough of this too. Do a test for GH (General Hardness). If you have at least 6-7 degrees GH then you are fine. If less, then buy Seachem Equilibrium and add whatever is recommend. This will take care of Mg as well. GH is the combo of Ca/Mg in your tank water (or tap in that case)

K - you will generally get enough of this if you consistently dose NO3 (w/ KNO3) and PO4 (with KH2PO4), but can also dose some K2SO4 to give it a boost. Aim for 20ppm per week of dosing K. It gets expensive dosing K with what you are currently using. It is easiest to dose with things like K2SO4.

All of the above you can obtain from www.gregwatson.com very very cheap.

Do some searching around on this forum and you will find a lot of dosing strategies.

This is just the beginning, so ask more questions as necessary.

Cliff
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post #5 of 6 (permalink) Old 07-11-2005, 12:29 AM
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Quote:
Originally Posted by shuks
I'm gonna get a 200 gallon tank that will be devoted to freshwater sting rays, and arowana's.
have 2 Sting Rays as well Leopoldi - jet black w/ white spots.

my website is www.fwstingrays.com if you need any info on them before purchasing. it is crappy formatted but has decent info

Cliff
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post #6 of 6 (permalink) Old 07-11-2005, 02:24 AM
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There are very few if any plants that could survive in a 75 gallon tank with only 40 watts of light over it. Whomever told you that was blowing smoke up your posterior.

Take a few minutes and read my Guide. At a minimum you should have 2 wpg over your 75 gallon tank. You don't state what your plants are. But the plants that can survive at lower light levels are most Crypts, most Anubias, Java Fern, Java Moss and African Bolbitis. Some swords can also tolerate lower light levels.
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