Rotala Deficiency? - The Planted Tank Forum
 
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post #1 of 13 (permalink) Old 07-23-2013, 03:47 PM Thread Starter
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Rotala Deficiency?

My tank is about 4 weeks old now. At the initial setup, all my plants were growing very fast, but now my rotala colorata and HM are growing very slowly, especially those after trimming. The new tips are stunted. The tip of the leaves have black marks. The leaves were red, and new tip is green now. Bottom leaves become transparent. It must be some kinds of deficiency. Maybe nitrogen or calcium. Anyone can help?

Here is my fertilizer dosing:
1ml ADA Brighty K daily
1ml ADA Green Brighty Step 1 (every 2nd day)
1mlp pfertz Nitrogen 1-2 time weekly
2 drops ADA ECA once a week
CO2 1 BPS 1 hours before light on, and 1 hr before light off, ADA drop checker light green at 30 ppm (with 4 dkH solution)
Light on 8 hours every day.
Temp: 76F

Water tested by API test kits:
pH: 7.4 (after adding Alkaline Buffer)
pH: 6.8 (at middle of photo period with CO2 on)
gH: 4
kH: 4
Ammonia: 0
Nitrite: 0
Nitrate: 10-20ppm
Phosphate: 0.25ppm

Fish:
3 Otos
6 Phoenix Rasboras


Equipment:
ADA Aquasky361 LED - cover up 6 LED bulbs because it is too bright
ADA Mini-S
ADA Aquasoil II
ADA Manten rock
ADA Vuppa-I surface sreener
AC20 HOB filter
ADA drop checker

10 Days ago:


Now:

Last edited by mheat; 12-28-2014 at 06:04 PM.
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post #2 of 13 (permalink) Old 07-23-2013, 03:50 PM
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try dosing a little iron and up your c02 a few more hours with the lights on
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post #3 of 13 (permalink) Old 07-23-2013, 04:00 PM
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CO2 CO2 and CO2.




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post #4 of 13 (permalink) Old 07-23-2013, 04:44 PM
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Quote:
Originally Posted by plantbrain View Post
CO2 CO2 and CO2.
+1 on co2. With all of my rotalas, I've noticed that when something happens with my co2/light balance, they start to stunt and grow weird. Some examples are when my co2 runs out and I take it to get filled. Or when the bio film builds up and starts to block some light. They're pretty finicky plants.

Josh
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75g | 22g Long
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post #5 of 13 (permalink) Old 07-23-2013, 06:10 PM Thread Starter
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My tank is a 5G ADA mini-M. For such a small tank, 1 bulb per second of CO2 should be enough, is it right? Drop checker is light green to confirm 30ppm. Since I use HOB AC20 filter, the surface aeration will drive off some CO2, but I think the CO2 level should be good enough. I am using the Do Aqua CO2 Starting Kit, Music Counter, Co2 Diffuser for pressurized CO2 injection.
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post #6 of 13 (permalink) Old 07-24-2013, 04:16 PM Thread Starter
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I up my gH to 6 by adding more Seachem Equilibrium, and also does more Nitrogen (0.5ml pfertz) every 2nd day. Co2 bulb up to 90 bubbles per minutes. I will give it a few week to see if it can recover. Anyone can give more advise?
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post #7 of 13 (permalink) Old 07-24-2013, 05:11 PM
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Additional co2 should help a lot. Also if the bottom of the plants are shaded too much, the leaves will fade some.
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post #8 of 13 (permalink) Old 07-24-2013, 05:17 PM
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its probably low CO2, but one question: were there changes in light that occurred around the time the rotalas went downhill? I noticed you are covering up some of the bulbs. Is it possible that your lighting is not bright enough . . ..

Increased lighting is usually not the answer, but thought I would throw it out there.

-ETK


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post #9 of 13 (permalink) Old 07-24-2013, 05:22 PM
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Quote:
Originally Posted by mheat View Post
My tank is a 5G ADA mini-M. For such a small tank, 1 bulb per second of CO2 should be enough, is it right? Drop checker is light green to confirm 30ppm. Since I use HOB AC20 filter, the surface aeration will drive off some CO2, but I think the CO2 level should be good enough. I am using the Do Aqua CO2 Starting Kit, Music Counter, Co2 Diffuser for pressurized CO2 injection.
Drop checker confirms nothing, the plants NEVER lie, various test methods do.




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Tom Barr
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post #10 of 13 (permalink) Old 07-25-2013, 03:02 PM Thread Starter
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ADA AQUASKY361 (LED: 0.4W/each x 30) is too bright for me. I struggled with dosing CO2 and ferts, and fight with algae. I then cover up 7 LED bulbs to reduce some light, and find easier to adjust balance the ferts, at lease there is no major algae issue.

Here after a week, and I have some improvement on the rotala colorata. New leaves have some pink color instead of green. Leaves on the HM are also bigger as normal.

Last edited by mheat; 12-28-2014 at 06:04 PM.
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post #11 of 13 (permalink) Old 07-25-2013, 04:51 PM
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Another issue is temperature changes, if the tank is operating at say 22C, then the temp goes to say 28-30C, well, the O2 will go down a fair amount and then plant rate of growth increases a lot, maybe 40-50% more.

You can compensate by adjusting CO2 to match, but most just fail and get issues.

You can also compensate by reducing the light intensity as you did, both are wise choices.

Summer/winter temp differences cause a lot of issues seasonally for hobbyists.




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post #12 of 13 (permalink) Old 07-25-2013, 05:32 PM Thread Starter
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Temperature may indeed a issue too. My room temp is pretty high in Summer time now. I use a small fan to blow air to the tank starting at 6:30 am, and the temp drop from 78F to 72F during the day. I turn the fan off at 8 pm because it is too noisy. The tank temp slowly goes up again from 72F to 78F overnight. My photoperiod is from 9am-5:50pm. Co2 is on from 8am-4:30pm.
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post #13 of 13 (permalink) Old 07-26-2013, 03:57 PM Thread Starter
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The new grow leaves have no black marks on them after a week. The bottom old leaves are blacken, and will die off and come off soon. I will give it some time to recover. It is very likely the Nitrogen deficiency because the plant draw Nitrogen from old leaves to new leaves.

Here is the ADA Aquasky361 with some LED bulbs covered to reduce the brightness.

Last edited by mheat; 12-28-2014 at 06:04 PM.
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