What is wrong with my Sword Plant??

[mike]

The leaves on my sword plant apear to be rotting as fast as they grow.

I have a soil substraight that is less than 4 months old, on the bottom I sprinkled osmocote, Murite of Potash and Dolomite, I then covered that with a soil and clay mixture which is about 1 part clay to 8 to 9 parts soil.

It's a 125G tank with easly 2500GPH of flow between the overflow, canister filter and 3 x Koralia 425s.

Lightihg is 2 x 54w T5HO lights on for 9 hours and I also have 2 x 39w T5HO and 1 x 96w AHS PC lights for 1 hour. I'm sure I have 30ppm of CO2 and well

I EI dose using a dosing pumps everyday

KNO3 - everyday 6 ppm
KH2PO4 - everyday 0.8 ppm (I know it's a little high, I noticed that today when I measured how much the pump was dosing. I lowered it to 0.5 ppm now)
CSM+B (Fe) - everyday .25ppm

Here are some pics of what the plant looks like

View attachment 4060

View attachment 4061

View attachment 4062

All the other plants in this tank a great, I have little to no algea

I have the same plant in another tank with an inert substraight, no root tabs, low light, low CO2 and underdosing EI and it's growing like a weed.

Thank you

Mike

 

[Tom Barr]

I'd cut the dosing back about 1/3rd. Swords tend to take awhile to get the root system established, the soil might have an issue for it vs the plain sand.

 

[mike]

Tom,

I also read they prefer loose substraight as well. It's been in the tank since mid september and not doing better. I reduced the dosing as you recommended. I'll give it another 4 to 6 weeks. Do you know what else can provide the same mass as the sword plant given my tank specs?

Thank you,

Mike

 

[Tom Barr]

You can uproot is and deep vac that area, then replant with plain sand.

 

[Dresdner]

the most important thing is light which is the main thing needed for healthy growth of the plant. you must ensure that5 your plant gets good sunlight to grow....