Nutrient deficiency Eleocharis parvula - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 03-25-2010, 08:01 PM Thread Starter
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Nutrient deficiency Eleocharis parvula

Hi All,

I have a small pico tank which has Eleocharis parvula in it amongst some java moss and a dwaft anubias with the aim of growing it into a carpet.

the stats:

1 gallon (estimated)
5w of light
fine gravel mixed with JBL AquaBasis
Flourish excel dosed everyday
Tropica Aquacare Plus (N + K) added twice a week
Tetra Easy balance added weekly

long story short i added two potted plants last autum and it grew well and sent runners everywhere and generally appeared to be doing well. for one reason or another i then neglected the tank for a month or so and pratically stopped attending to it i.e no feed etc. a green algae like film covered the water surface and the Eleocharis parvula turned yellow from the tip down and started to die off fast. the older growth was affected more. i instantly stepped things up again and started feeding again but the film remained, if i skimmed it off it was back within a day or so. no other algaes were or are present.

I have now cleaned the filter and increased the surface movment and no more green film (yet) and i'm adding Flourish excel each day (1ml) and 1 ml of Tropica ferts twice a week (all as i did before).

So my question really is, have i shocked this plant and have to wait for it to recover? or is it lacking a nutrient which just happend to coincide with me negleting the tank for a few weeks?

i have got the tiniest amount of green algae on the glass of the tank but the snail is generally keeping on top of it. i have the tank full of cherry shrimps after they bred in there so they keep the tank in tip top condition.

These changes have been in affect for 3 weeks now and no improvement? but the yellowing appears to have ceased. and the anubias is strong and healthy and sending out new roots.

thanks!
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post #2 of 5 (permalink) Old 06-25-2012, 09:50 PM Thread Starter
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Hey all...

it's been a while but I'm still struggling with Eleocharis parvula. after my original thread it all died and i gave up. about three months ago i bought some online and gave it another go. initially it did nothing then sent out some runners, not many but a few. All looked promising and now in the last few weeks no growth and the existing growth is going brown from the tip down. If i don't act soon it'll all die again.

I have sufficient light, water flow, the only bio load are some cherry shrimps and a algae eating snail. the tank does not suffer from Algae at all other than some green surface scum which I've cleaning off.

I have been trying to add Profito liquid feed daily (4 drops to a 5L Pico) and 4-5 drops of easy carbo liquid carbon....i add some fish flakes when i think of it and the shrimps seem fine.

The anubias grows well, sending out new roots and leaves on a regular basis. I've just pulled out most of the java moss in case Allelopathy may be the cause????

I'd be grateful for comments.
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post #3 of 5 (permalink) Old 06-27-2012, 09:45 AM Thread Starter
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Hi All,

Hopefully someone can respond to this thread!?!

I read up yesterday and discovered that liquid carbon feeds can have a negative affect on this plant. Some other people also found that it went brown under these conditions.

As a test I carried out a third water change last night to try and dilute the chemicals in the water. I then added a root tab near some stronger growth in case part of the problem is nutrient related.

I have also changed the bulb in case this was another factor.

thanks,
Graeme
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post #4 of 5 (permalink) Old 06-27-2012, 03:22 PM
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Haven't grown E. parvula but acicularis is fine with liquid carbon products.

ProFito is not a complete feed. It is potassium and traces, there is zero nitrate and phosphate. I suspect that is the issue you are having. The Tropica product you had before has NP I believe. Most root tabs aren't complete feeds, check the label.

Your light is probably very low for hairgrass as well. Moss and Anubias can do well with a lot less light than hairgrass and are probably scavenging the nitrate and phosphate the shrimp waste contains.


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post #5 of 5 (permalink) Old 06-27-2012, 03:39 PM Thread Starter
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Hi Kathyy,

Thanks for your feedback. I will look into the nutrient ratios of the root tab i've used. I have some KNO3 and Pottasium Sulfate i believe so i can manually add in the NPK I need. I will start to do this immediately.

E. parvula has grown in there before with the light so i suspect this is a combination of liquid carbon affecting growth and possibily my NPK requirements.

Do you know if E. parvula grow's quite fast? I hope so as i'd really like a dense carpet affect.

Thanks,
Graeme
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