What is causing pale new growth? - The Planted Tank Forum
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post #1 of 7 (permalink) Old 10-06-2016, 03:17 AM Thread Starter
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What is causing pale new growth?

Hi everyone,

My tank has been running for a year. 75 gallon, Finnex Ray II, 7.5 hrs of light per day. Pressurized CO2 with inline diffuser, about 3 bps so drop checker is lime green. EI dosing the following:

1/2 tsp potassium nitrate 3x week
1/16 tsp potassium phosphate 3x week
3 mL flourish comprehensive 3x week

50% wc once a week
kh=4, Gh=6
substrate is black fluorite sand

My plants are getting pale at the tips. Any idea as to why this might be happening? Is this a sign of a specific deficiency?
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post #2 of 7 (permalink) Old 10-06-2016, 03:41 AM
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Originally Posted by Jendigo View Post
3 mL flourish comprehensive 3x week
Is this a typo
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post #3 of 7 (permalink) Old 10-06-2016, 04:23 AM Thread Starter
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Nope, I use Flourish to supply the micros. Am I dosing too little?
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post #4 of 7 (permalink) Old 10-06-2016, 04:34 AM
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3ml seems really low for a 75
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post #5 of 7 (permalink) Old 10-06-2016, 09:41 AM
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That's roughly .04 ppm Fe calculated at 65 gal.

Pale new growth is typical sign of Fe deficiency. Another thing is the Fe in Flourish comp is gluconate, which doesnt stay around long if PH is much above the low 6s, few hours maybe.

Think it would be safe to up that dose to around 10 ML 3x week, possibly more but I'd try something like that first. After a week if things arent looking better increase it another 5 or 10 ML.

If that doesnt work, might consider switching to csmb, which uses chelated edta Fe


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post #6 of 7 (permalink) Old 10-07-2016, 01:02 AM Thread Starter
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Okay, thanks very much for the replies. That sounds like a good place to start. When I first set up my tank I actually was dosing csm+b but then I had a diatom outbreak and made the switch to Flourish and the tank seemed happier. Definitely might be worth a try switching back to see what happens. I'll start by upping the dose of Flourish first to see if that helps. I do have quite a bit of plant mass so I think you guys are right, I should be dosing more micros.
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post #7 of 7 (permalink) Old 10-26-2016, 02:59 AM Thread Starter
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Update

I increased my micro dose to 10 mL of Flourish Comp 3x a week and things are definitely looking better now after a couple of weeks. I've also started adding 1 tsp of GH booster after each water change. I'm going to try switching to csm+b now to see if that will improve things further. After reading some of the posts on micro toxcicity and noticing that the rotala butterfly calculator has just changed it's recommendations for csm+b, I've decided to start out with a cautious target of 0.1 ppm Fe. I've mixed 1 tsp of csm+b in 175 mL of water and plan to add 15 mL of this 3x per week. Hopefully I've done the math right, any suggestions are welcome.
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