Too Much Flow?

[fleeing]

I'm really not sure what is causing this, insufficient light, dosing fluid carbon or just too much flow, but my heteranthera zosterifolia's leaves are becoming glassy, progressing to transparent and then dying.

I have heard that zosterifolia does not do well with fluid carbon, so that may be the cause. But after being given a few shoots of echinodorus/helanthium vesuvius, I'm seeing the same kind of thing on the edges of it's leaves.

I'm running two bars of TMC Grobeam 500s at 85% on a 200l (TMC recommend 4 bars! but all other plants seem to be thriving), filter is a throttled ex1200 and eheim 2026, additional flow with a Tunze nano 6015. Macro and micro ferts and daily HappyCarbo.

Any ideas?

 

[RadaR]

I suspect lack of CO2. Structural failures in plants points towards lack of CO2 because 40% of the dry weight of a plant is carbon.
It might not be enjoying the liquid carbon product. Some plants don't like it, such as bladderwort and some species of Vallisneria.
Decrease the light or invest in pressurized CO2.
I highly doubt it's too much flow. We strive to achieve good flow in planted tanks. Helps distribute the nutrients and CO2.

 

[fleeing]

Thanks for the response. Of course pressurized CO2 would almost certainly help considerably. Unfortunately prices in Denmark are horrifying (150 quid for a 2kg fire extinguisher), although I might be able to get hold of a 500g set for a reasonable price. Any estimate as to how long a medium planted 200l/7 hours lighting per day, would run with a 500g bottle?

I'll move the heteranthera to an aquarium that I don't dose with liquid CO2 for a while, and see how it goes.

 

[RadaR]

Any estimate as to how long a medium planted 200l/7 hours lighting per day, would run with a 500g bottle?

Apparently, "500g lasts eight weeks with no shut-off solenoid". That's on a 125litre.
So CO2 on for 24/7 on a 125litre tank using 500g cylinder lasts 8 weeks.
If you used a solenoid and turned CO2 off when the lights were off, I rekon you could get 2months out of it.

 

[fleeing]

Looks like I'll try with the 500g set then. A refill apparently 'only' costs about £20.

Thanks for taking the time to reply.