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Discussion Starter · #1 · (Edited)
HC Cuba & S. Repens yellowing

Need some help to figure out what's wrong.

First, some info:
20g Long, been planted for 1.5 months
Substrate: Netles Lambo from AI, with Seachem flourish tabs
Ei Dosing -- KNO3, KH2PO4 & TE from HydroTech [last test results: Ammonia 0ppm, Nitrite 0ppm, Nitrate 20ppm, PH 6.2, Phosphate 1.0ppm, KH 3.5, GH 8, weekly WC]
Filter -- Fluval 206 + Marina HOB s10 (for surface agitation)
Pressurized CO2 with upaqua inline atomizer -- indicator greenish yellow
Lighting -- Aquaticlife 2xT5HO, 24" above substrate. Lights on from 3pm to 11:30pm. CO2 on from 2pm to 11pm.

For the last 2 weeks, I notice my HC cuba (thanks walleye!) and my S. repens (thanks coldmantis!) are starting to yellow. I thought it was some kind of Fert Deficiencies at first, but the test results proved otherwise. Other plants in the tank are doing well. Pearling begins 2-3hrs after lights on (even the HC cuba ad S. repens)! But they are just not green and healthy looking like some of what our other members have.

Am I missing something here? Any help is much appreciated!
 

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I am seeing a yellowish shade all over. I notice you have lots of driftwood, maybe its tannins making everything look yellow. A large wc may help.
 

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Discussion Starter · #5 ·
Thanks jimmyjam and pyrrolin. I will do a check on nitrate and iron before my weekly 50% wc. I also lowered my light to 20" above substrate, crank up the co2, they seemed to yield some improvements on both plants.

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I have noticed this on some of my tanks in the past and appeared to be the way the light fixture was set up.

Possibly if placed in center of the tank the edges of the bottom of the tank like the front dont get as much light depending on reflector and focus.

My solution was do play around with the light fixture by moving it forward. Your fixture appears to be high 24 inch from substrate you may want to try lowering it etc...

I also like JimmyJam response possible Iron/ nitrate deficiency

Also are you adding dry ferts? I havnt seen this mentioned before but I have always been curious...if the dry ferts are added to the aquarium and sit on the plants is it possible they are burning the plants?
 

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good call kyle, always check your lights, if your not getting enough lighting/ par at the bottom, this can def happen. If your doing ei dry fert, then make sure your dissolving it in luke warm water as described by tom barr.
 

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Discussion Starter · #8 ·
Thanks kyle. Yes, I was dosing dry and I also suspected those were burnt. Is it okay to mix the dry NPK together in water, right before dosing?
 

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Discussion Starter · #10 · (Edited)
Thanks coldmantis. Yes, my dosing was quite exact. 2in above a 20 long is roughly 14 in above substrate? I think that's the trick. Mine was 24in above, and I just lowered it to 20in.

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Discussion Starter · #14 · (Edited)
Thanks again Jimmy and everyone for your wonderful suggestions!

Here are a few updates:
  • I have lowered the top light to around 20" above substrate. This is the lowest I think I should do without creating an algae breakout on my other plants.
  • To give my S. repens and HC Cuba extra light, I have added another clip-on CFL, positioned 7" in front of the front glass between 7pm-9:30pm.
  • All dosing amount remain virtually unchanged.

Now here are the results. I guess so far so good, uh?!
 

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Discussion Starter · #16 ·
That's was about a week and a half. Mind you, the magic of camera white balance also helps too! Yes, the first thing I did was up the light and the CO2.
 
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