Necrotic spotting?? Echinodorus bleheri Help

[megwattscreative]

Hi all, any idea what's going on here?

Have had a look on the duckweed index and not entirely sure. I'm thinking it's necrotic spotting but again, not sure what from. Ive recently added large water lettuce that I think may be monopolising the ferts. It could also be related to the new lack of light, due to the lettuce?

I have recently cleaned the mattenfilter too, although unsure if that would make a difference.

I've also noticed some leaf yellowing and moulding on the water lettuce, although I assumed this was because they have gone to a high light intensity tank to a low light intensity. I have just started a new job so haven't been very vigilant at removing fuzzy/yellow leaves: the fish all seem fine but I don't want this to affect water quality.
Quite a few of the aquatic plants are looking a little lean atm. I add a small amount of fertiliser, 2.5g spoonful of chempak chelated iron & 2.5g spoonful solufeed per water change. Any advice welcome 🙂 I have one journal with tank deets in there for reference! this set up is over a year old.

 

[Connswater]

few of the aquatic plants

Very interesting. Good call I think.

You have certainly taken the use of duckweed very literally! The duckweed looks a good colour of green, that is, to my terrible eyes, and I did art O level and still find green hard to describe. Honestly, I need a green colour chart before me as an aid memoire or my descriptions are just wrong.

I very much suspect you guess correctly that light not penetrating down is part of the issue. I have to harvest floating plants twice a week. I would personally add some nutrient tabs in the substrate around rooted plants and make sure only about a 1/3rd of the water surface is covered with floating plants rather than just relying on water column fertilisation. Foliar feeding in the garden doesn't really help with many plants, they need fertile soil, crypts for example, in an aquarium, I find don't want much in life other than rich substrates and moderate light. The water lettuce looks burnt, did you splash some fertiliser onto it? Strong light can do similar things, but then the salvinia would look brown, it also goes brown with a lack of Nitrate, not an issue in my tank.

I know there is a man here who should be able to advise better than a mere amateur like me!

 

[megwattscreative]

Interesting! Thanks for the advice. The plant pictured above is an Amazon sword (echinodorus bleheri). At least, that's what I think it is!

The duckweed is rampant at the moment, I need to have a major clear out. But, the water lettuce, Amazon frogbit and salvinia are the normal residents. The water lettuce may have been splashed by heavily diluted ferts during water change. However I think the yellowing is from being submerged and condensation, from what I've read - they're not keen on high humidity.

Funnily enough, Crypts normally do quite well in my tank - they are slow growing but I have quite a few in inert play sand. They all recovered from initial melt if I remember correctly. There's a few clumps of cryptocoryne wendtii brown and green.

 

[dw1305]

Hi all,

The plant pictured above is an Amazon sword (echinodorus bleheri). At least, that's what I think it is!

It is - <"Echinodorus grisebachii 'Bleherae' - Tropica Aquarium Plants">.

The duckweed is rampant at the moment, I need to have a major clear out.

Quite a few of the aquatic plants are looking a little lean atm. I add a small amount of fertiliser, 2.5g spoonful of chempak chelated iron & 2.5g spoonful solufeed per water change

Give the floaters a thin, and see what happens. If things don't improve? I might dose a little bit less for a while.

I have dim and distant memories that excess plant available iron (Fe) (and / or manganese (Mn)) might cause a similar symptom.

cheers Darrel