Floating plants

[Colin_T]

A lot of floating plants will rot if kept under coverglass.
Water constantly splashing on their leaves will cause them to rot.

GH does not kill floating plants.

Have you tried water sprite (Ceratopteris thalictroides/ cornuta)?

 

[CaptainBarnicles]

I very much doubt that the GH is the problem. Light and nutrients are what plants need. Too high a light intensity might burn the leaves, but usually there are insufficient nutrients in balance with the light. Floater are rapid growing plants and thus need more nutrients. Are you using any fertilizers?

Taken a screenshot, thank you for your help...

 

[FishHobby99]

Taken a screenshot, thank you for your help...

Do you use a Fluval Aquasky?

 

[CaptainBarnicles]

A lot of floating plants will rot if kept under coverglass.
Water constantly splashing on their leaves will cause them to rot.

GH does not kill floating plants.

Have you tried water sprite (Ceratopteris thalictroides/ cornuta)?

I have the Fluval Roma 240...so it's hooded.

 

[CaptainBarnicles]

Do you use a Fluval Aquasky?

It's the Plant 3.0...the previous light was very weak so I upgraded

 

[Colin_T]

I have the Fluval Roma 240...so it's hooded.

I have no idea what that tank is like

 

[CaptainBarnicles]

I have no idea what that tank is like

It looks like this...

 

[FishHobby99]

I have no idea what that tank is like

Just noticed your signature. That expression you like has been around for a long time

 

[Byron]

Taken a screenshot, thank you for your help...

I asked the question, but someone will have to decipher this graph for me! I am no good whatsoever with anything electronic or digital or whatever this is. I really sympathized with @Colin_T a couple weeks back about the phone...got my first mobile phone last year before going into hospital, still can't understand the blasted thing. There are only a couple people who have that number, and they know never to call me using it because I simply will not answer it.

 

[CaptainBarnicles]

I asked the question, but someone will have to decipher this graph for me! I am no good whatsoever with anything electronic or digital or whatever this is. I really sympathized with @Colin_T a couple weeks back about the phone...got my first mobile phone last year before going into hospital, still can't understand the blasted thing. There are only a couple people who have that number, and they know never to call me using it because I simply will not answer it.

It wouldn't have helped you anyway as I've just realised it's an old picture!

I have a 'sunrise' from 11am until 1pm, then lights run at 50% until 8pm when they start their 'sundown' mode and switch off at 10pm

 

[Byron]

It wouldn't have helped you anyway as I've just realised it's an old picture!

I have a 'sunrise' from 11am until 1pm, then lights run at 50% until 8pm when they start their 'sundown' mode and switch off at 10pm

That is certainly adequate; the main issues are the "daylight" which at seven hours is OK (my tanks are the same, to avoid any problem algae), a period of total and complete blackness for several hours. The lights for dawn/dusk though can be issues, as this is not sufficient for plants but again algae can use it. Two hours may or may not be an issue, so you might consider reducing these two periods, maybe.

Edited to add missing letters from words (my typing is getting worse along with everything else!)

 

[CaptainBarnicles]

That is certainly adequate; the main issues are the "daylight" which at seven hours is OK (my tanks are the same, to avoid any problem algae), a period of total and complete blackness for several hours. The lights for dawn/dusk though can be issues, as this is no sufficient for plants but again algae can use it. Two hours my or my not be an issue, so you might consider reducing these two periods, maybe.

I've reduced red and blue light to 0 as suggested by another member (although I thought red light was good for plant growth?) I've also stopped the use of ferts for now to see if that makes any difference...should I reduce dawn/dusk to an hour each?

 

[Byron]

I've reduced red and blue light to 0 as suggested by another member (although I thought red light was good for plant growth?) I've also stopped the use of ferts for now to see if that makes any difference...should I reduce dawn/dusk to an hour each?

The issue is dying floating plants, not algae, so do not discontinue the TNC Lite; just don't over dose it. Floating plants need good nutrition as thy are fast growers.

I don't think there is a problem with the timing of the light as in post #25...but the 50% of daylight might be too little intensity. You can increase this, just watch for algae.

What is the "red" and "blue"? These are needed for photosynthesis, but they need to be in a white mix, not individually. I've never seen evidence of straight red and blue so I don't know just how this plays out. But good white light is high in the red, blue and green wavelengths, and one indicator of this is the Kelvin rating; Somewhere in the range of 5000K to 7000K usually provides this--though it must be said that not all 6500K light is the same. You have LED which I am not much good with, but you do want the brightest light to be white with the high peaks in the red, blue and green.

 

[Bruce Leyland-Jones]

I've reduced red and blue light to 0 as suggested by another member (although I thought red light was good for plant growth?) I've also stopped the use of ferts for now to see if that makes any difference...should I reduce dawn/dusk to an hour each?

I too greatly reduced the blue because some here said it encouraged algae

The OP's problem, as @Byron said, is that his floating plants are dying.
Talking about what you did to reduce algae is not relevant here.

 

[Byron]

I too greatly reduced the blue because some here said it encouraged algae

Yes, blue light is notorious for encouraging "problem" algae, and that I think may be part of the reason just red and blue do not work. It is that mix in pure white that matters. The dawn/dusk settings often use blue, and it can have consequences.