What's at the root of this? (Green spot, dying leaves)...56k AWAY with ye! - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 03-03-2013, 12:51 AM Thread Starter
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What's at the root of this? (Green spot, dying leaves)...56k AWAY with ye!

Hi all,

I'm wondering if something's amiss here - I know my CO2 levels are pitiful, but I'm putting half a capful of Excel every other day and Flourish twice a week until I get a pressurised system. The new growth seems OK, yet the older parts of the leaves are dying.
Also, this green spot algae...normal from what I've read?

I've never 'trimmed' the grass (pygmy chain sword) - perhaps that's part of the issue.

Tank :
3ft long 30g, 3x23W Philips 6500K CFLs, Fluval 205 with an assortment of sponge and rocks. Photoperiod 5h (1630-2130h).
Playsand and organic soil substrate with a team of MTS.

Parameters, etc :
Ammonia = 0ppm
NitrAites = 0ppm
NitrItes = 0 ppm
pH = 8
dKH = 5.5

Attached are a few images of what's afoot...also, those pesky pond snails...
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post #2 of 5 (permalink) Old 03-03-2013, 01:09 AM
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A 3 foot long 30 gallon tank is only about 17 inches high, so the substrate is about 15 inches from the top of the tank. That means it is likely that you have enough light from those CFL bulbs to drive the plants to grow fast, but to do that they need to have access to NPK, trace elements, and carbon, all in non-limiting concentrations. You measure zero nitrates, which is the N source for the plants. You don't dose any significant amount of phosphates (P) or potassium (K). And, you dose Excel only every other day. You are very likely to be starving the plants. See https://www.plantedtank.net/forums/sh...ad.php?t=21944 for a good, effective way to be sure you are providing all of the needed nutrients in sufficient quantities.

Hoppy
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post #3 of 5 (permalink) Old 03-03-2013, 01:23 AM Thread Starter
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I figured it was time to start dosing - This has only happened some six months in. Perhaps the substrate has given all it can and the bioload is not enough to generate nitrogen. Would I be correct in assuming Flourish is taking care of micro and trace, but the macros are missing?

CO2 is also very, very low. Start all in one shot - it has to be balanced, no?
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post #4 of 5 (permalink) Old 03-03-2013, 03:05 AM
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Most people say it is balance that is important, but I think it is providing everything the plants need that is most important. It does no harm to provide more than the plants need, so you want to make sure you have provided everything in sufficient quantity. The more light you have, the more food the plants need.

Yes, the Flourish Comprehensive is a trace element mix. You need to dose NPK separately.

Hoppy
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post #5 of 5 (permalink) Old 03-03-2013, 03:08 AM Thread Starter
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A thousand thanks.

My takeaway:
Light is OK. Trace are ok.
Add macros, add co2.

Thanks!
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