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Discussion Starter · #1 ·
Hi,

Currently having some trouble with my Anubias. They seem to have several dark spots on the leaves and on the edges of the leaves. No spots present in newer leaves. I'm thinking this is algae since the anubias are all exposed directly to light. I'm currently running a low light tank with LEDs and the LEDs are set to about 40% output (aiming for about 30-35 PAR). Pictures: http://imgur.com/a/WB1L5

About my tank:

36L (9.5G)
Eheim 2213 filter
Eco-complete substrate
Recommended dose of excel every other day
Recommended dose of comprehensive once a week
PH: 8.1
VERY hard tap water (RO is not an option right now)
Tank has been running for about 4 months now
8 hour photoperiod

I've always had trouble with diatoms but have managed to keep it under control with Ottos and Amano shrimp. The spots on the anubias appeared recently after I left for a trip and the shrimp nor the ottos seem to touch it at all.

I can easily adjust light level and photoperiod, but at this point I have no idea whether I should increase or decrease light if necessary.

Can someone help me ID what this could be?
 

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It looks like potassium deficiency to me. You have yellowing at the tips & brown holes look like they are forming. Without seeing the link I was going to say green spot algae which would be a lack of carbon for the driving forcr of the lights. But seeing the link my gut feeling is potassium deficiency. I feel good about making that call.
I forgot to look back to see what your ferts were. Try separate dry K from planted fertilizer.com. They have KSO4 which is potassium sulfate. Read the mixing instructions. You could bump up the iron a little would not hurt.
 

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Another thing, your photo period seems short. I would add & hour or 2. 8 hours is nothing. The flourish does not have a lot of K in it as well. Your tank is like mine . I have a 10 myself. I dose at least 3-5 drops per day of straight (KSO4).I also dose 5 or more drops of iron every day. But my lighting may be more than yours. I run 2 ( 15 watt) T8 s . My lights run 11 hours a day & my Anubias looks good.
 

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Tírëd Äßóût ╦σ RÉ├írë.
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Another thing, your photo period seems short. I would add & hour or 2. 8 hours is nothing.
Really? You need 10 hours of photo period to grow weeds?

Lower light from 8 to 6 hours for a week or 2. Actually Plant dont need that much light, its a myth. All my tanks get only 7 hours of light. Start dosing Excel daily and do water change as 2-3X/week. I see BBA in some leaves..
 

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Discussion Starter · #9 ·
Thanks for all the feedback.
I should probably mention that this is a non-CO2 tank.

It seems like the issue is indeed algae. With some heavy brushing, the black spots can be removed from the leaves.

I will start dosing excel daily and try to do spot treatment with excel on the affected areas.
 

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I see BBA in some leaves..
where?

It seems like the issue is indeed algae.

I will start dosing excel daily and try to do spot treatment with excel on the affected areas.
I don't think it's just algae. I think you have nutrient issues too. if those don't get addressed, than you will be inviting more algae down the road. dosing excel as well as spot treating sounds like overdosing glutaraldehyde.
 

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Discussion Starter · #11 ·
I don't think it's just algae. I think you have nutrient issues too. if those don't get addressed, than you will be inviting more algae down the road.
Fair enough. I have all the necessary dry ferts to dose, but I was never sure what sort of dosing regime to start off with.
I did find this guide: http://www.sudeepmandal.com/hobbies/planted-aquarium/guide-low-tech-excel-planted-tank/ based on one of Tom Barr's posts, "Non CO2 methods", but so far I haven't tried dosing at all for fear of killing my livestock or messing up the entire aquarium. Anyone have any recommendations beyond this link?

dosing excel as well as spot treating sounds like overdosing glutaraldehyde.
Sorry, I meant I will dose excel daily and use that same daily dosage to do spot treatment.
 

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O.K. so you do not run your lights for more than 6 hours because they are weeds. False, they are plants. If you are afraid to leave lights on for more than 8 hours at a time than you yourself can & will grow algae because you are lacking something as well.
If plants have all nec. nutrients as well as carbon than more than 8 hours will not be a problem. I never thought of the plants as weeds. If you enjoy cutting back so much on lights because of fear of algae than maybe you should address your issues with imbalances.
I could run my tank 14 hours photo period a day if I wanted to. Why, because zero nutrient issues are present in my tank because I dose dry ferts & run pressurized carbon. I am not afraid of growing algae, algae will not compete.
If you do not run pressurized carbon than bumping up the excel should help as well as dosing dry ferts to customize your tanks needs.
You should not be afraid to run your tank for more than 8 hours. In nature they run on 12-14 hours a day. If you cannot than you have imbalances. improper lighting spectrum, should be 6500-6700k only, proper carbon, NKPo4, tracse, Fe , Mg , Ca to name a few need to be addressed. Nitrogen cannot crash, same as phosphates . N needs to be above 10ppms & PO4 needs to be above .5ppm at least.
 
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