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Discussion Starter · #1 ·
20 long tank
finnex 24/7 just running whites 8 hours.
Pressurized co2 + diffuser + powerhead on top to better circulate co2
Flourite black sand + Flourish Root Tabs
Aquaclear 30 and just added surface skimmer 2weeks ago

I may found the reason why the hc cuba baby tears are starting to yellow, it was growing so fast then randomly yellow? Made no sense to me. I have a diffuser and a powerhead right on top of it so the co2 is distributed around the tank and my drop checker on the opposite side is always lime green/yellow which make sense because co2 is being pushed to the other side.

However when does the co2 actually dissolve? When it pops on the surface? I added a surface skimmer so all the bubbles that pop the surface water goes down the skimmer which creates oxygen because air is entering. Could it be the drop checker is yellow because all the co2 is being pushed around but then the surface skimmer is adding oxygen bringing down the co2??? Most of the yellowing are the ones right under the light and here and there on the ones that are not, i added 10 neon tetras if its because too much light not enough nutrients(fish) but i also have root tabs. Here is a pic
 

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I believe your light is sufficient and you are using a good quality substrate. Normally, root tabs are used as a supplement for deep rooted plants like swords rather than plants with shallow root systems. I make my own root tabs with Osmocote Plus in 00 size gelatin capsules.

HC Cuba is not an easy plant. Monte Carlo is much easier but the leaves are larger. I would start dosing using an EI regimen and then make adjustments according to the demands of your tank. Yellowing is often associated with either a nitrate or iron deficiency but the leaves are so small other deficiencies may be more difficult to detect.

Mike
 

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Agree with mredman, you have good light, co2 and your not really dosing. Those root tabs are really just a micro fert in tab form. Just dose the water column via EI, you don't even need the root tabs.
 

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Discussion Starter · #4 ·
Thanks for the reply, so are you saying the surface skimmer has nothing to do with it? Driving off all the co2? I have a 7 gallon same setup thriving and this 20 was thriving also , i planted really like 1 or 2 roots and each became like 8 or 9 and now randomly starts yellowing? And could it be because in the 7 I have 3 ottos and shrimps and thats enough, and the 20 I have 3 ottos and shrimps which was not enough? For nutrients
 

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Put your co2 diffusor under the intake to your AquaClear. That makes a great reactor and will dissolve the co2 far better than just letting it rise to the surface. Bubbles that make it to the surface are lost and cannot be dissolved. Also, the AquaClear outflow goes straight down so co2 rich water is driven deep into the tank.

With co2 you need to be dosing the full line of fertilizers. At the moment you are really only dosing micro nutrients. Unless you have a very overstocked tank you will not be able to feed enough to grow plants well.

Get an order of EI dry ferts, you will not regret it and for about $20.00 you will get enough for a couple years. You cannot even get a month worth of liquid fertilizer for that much. Look up user nilocg, he will fix you up and tell you how much to dose.
 
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