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Discussion Starter #1
Both tanks are 10 gallons and same dimensions.

Tank 1 plants:
Primrose
Crypt red wendtii
Anubias nana
Pearlweed
Christmas moss
lymnophila aromatica

Tank 2:
Primrose
Crypt lucens
Crypt Becketti
Lymnophila aromatica
Ammannia Senegalensis
Green foxtail
Anubias Afzelli (I think, trimmed down to nothing so will be a while before a positive ID can be amde)

Tank 1 growth is absolutely awesome, tank two all plants struggle. Tank ages within 6 weeks of each other with tank 2 being older.

Dosing:
NO3 10ppm, PO4 .77ppm, K 15ppm Sun, Tue, Thur
CSM+B to 0.3ppm iron Mon, Wed, Fri
Mg 10ppm and Calcium 40ppm Sunday after water change
Excel 4ml Sunday after water change and 1ml every day

Lighting is same 48 inch fixture over both tanks evenly distributed. 80 watts with one daylight bulb and one plant grow bulb.
Filters are AC 20 HOB. Bulbs less than 6 months old.
Substrate is exoxy gravel with about 20% plain river run smaller gravel.
Both tanks have crushed coral for pH and KH.

When I test for PO4, NO3, pH, KH and GH the test results are indistinguishable. Tests always show right balance and never a deficiency in anything nor an excess.

Both Tanks:
pH 7.2
GH 8
KH 7-8
PO4 1.5ppm
NO3 15ppm
Ammonia 0
Nitrites 0

Plants in tank 2 show no signs of any deficiencies at all, just stunted growth.

Can anyone tell me what I am doing wrong in the second tank?
 

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Discussion Starter #3
Tank 1 has no ammannia, is in transition still from emersed form.
Primrose has to be trimmed once every other week and grows 6 inches in 2 weeks or less.

Tank 2 has the ammannia, it is starting to grow but still struggling. I think the roots need to get established before seeing any noticebale growth. The primrose looks terrible and grows about an inch every 2 week. The leaves are small and the stems are thinner.

I did forget one plant in tank 2. I have Hemianthus Callitrichoides floating on some plastic canvas. Could it actually be sucking up that much or hindering the other plants?It doesn't grow very fast at all, even the parts that are emersed so I didn't think it would be a problem or the cause of the problem.

You can kinda see it in the upper left corner of tank 2.
 

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Hmmm. I would have to think it's lighting and/or CO2. Any algae growth on Tank 2? Maybe up the dose on Excel.

How's the growth on the Hemianthus?
 

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Discussion Starter #5
The lighting is the exact same 4 foot shop fixture over both tanks.

The Hc grows slowly. No algaae in either tank except for what is left and hasn't been eaten by the fish yet.
 

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Try adding gravel supplement to the 2nd tank. Many of those plants take most of their nutrients from their roots and not the water column.
 

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Discussion Starter #8
Crypts get root tabs in both tanks and so does the Ammannia in the second tank. The GH of both tanks is always between 7-9 and I don't have a calcium test.

Could be the fish loads, unlikely but possible. The BN do get zucchini so they waste could be easier to use than the other tank and just dosing.
 

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I have encountered an information regarding Ammania senegalensis.
Chris, how are you doing with that plant so far? I'm interested to hear that.:)
 

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Discussion Starter #11
My ammannia is just "there" It grows rather slowly but it is unfortunately taking forever to completely transition. I think it should take off once it finished the transition but until then I deal with it.
 

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As caferacermike stated here...
caferacermike said:
Remember it is all a cycle. To much or not enough and you get poor results.

To much lighting and no added co2. The plants will slow down their growth but algae will grow ultra fast due to excess nutrients that the plants are not using.

To much lighting and no supplements, no more growth.

To much Co2 and not enough lighting. The tank can crash and have all kinds of PH problems.

To much Co2 and not enough ferts. Same as above with to much lighting and not enough ferts.

to much ferts and not enough light. Extremely bad. Plant growth will slow and algae will abound.

To much fert and not enough Co2. Instant plant burst until they run out of Co2 to synthesise with. Instant algae problem

Also remember that the bulbs spectrum plays a huge role. Bulbs out of spectrum or worn out will contribute to either no growth or algae problems.
This is why I questioned about the lighting, CO2, and if there were any algae growth. With no algae growth, I would have to suspect not enough CO2.
 

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Discussion Starter #13
Bring on the suggestions, I am always up for any opinions, as long as constructive and this has all be just that, constructive! :shock: Lots of possibilites and could be any of them just because the tanks are just that, 2 different tanks.

There is a chance that the cause is the plexi cover I have over the second tank. The first one has glass. I am sure there is a refractory difference and it could be blocking some of the spectrum of light that the other tank is getting. Just never thought of it before.
 

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fish_4_all said:
There is a chance that the cause is the plexi cover I have over the second tank. The first one has glass. I am sure there is a refractory difference and it could be blocking some of the spectrum of light that the other tank is getting. Just never thought of it before.
That would do it.
 
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