Problems with plants?

[PremierFantasy88]

Can anyone help with identifying the problem I'm having with the plants in my tank? No doubt it's simple but I'm more of a fish guy than a plant guy...

4 foot tank with 24w fluval aquasky led
Hard to describe the light output due to the different settings in the app but it's on a medium/high setting for 7 hours (10am - 5pm) then a very low setting for 5 hours (5pm - 10pm)
No CO2
TNC complete ferts

Plants are Brazilian Pennywort as a floater (covers 85% of the surface)

Echinodorus parviflorus dotted around in a few places

+ some mirosorum dotted around in a few places

A lot of the Echinodorus leaves are dotted in brown spots. The one consistent with all plants is they all have browning edges

Any help appreciated

 

[simon_the_plant_nerd]

That looks like diatoms. How old is the tank?

 

[dw1305]

Hi all,

That looks like diatoms.

Yes, diatoms.

cheers Darrel

 

[PremierFantasy88]

That looks like diatoms. How old is the tank?

2 years

Then pennywort floating has been in there since day 1 but the rest were only added mid Feb

 

[dw1305]

Hi all,

Then pennywort floating has been in there since day 1

Do you have any snails?

cheers Darrel

 

[PremierFantasy88]

Hi all,

Do you have any snails?

cheers Darrel

A group of assassin snails but that's it

I've got my nannoptopoma in there, thought they may be interested in having a nibble on the diatoms growing on the leaves but appears not

 

[dw1305]

Hi all,

A group of assassin snails but that's it

That partially explains it, Ramshorn Snails etc. would make short work of it.

I've got my nannoptopoma in there, thought they may be interested in having a nibble on the diatoms growing on the leaves but appears not

Interesting.

cheers Darrel

 

[MichaelJ]

Yes, mostly Diatoms and some Green Spot Algae on the Pennyworts and Anubias. As Darrel said, some Ramshorn snails will take care of the Diatoms... Time will as well, although I've noticed that I occasionally see some diatoms in one of my very mature tanks where I don't (can't) keep snails due to very soft water - not sure why I occasionally get the diatoms.

Cheers,
Michael