My plants look sick.

[fishshl]

My plants look sick.

There are a lot brown spots on the leaves of Afzeli Anubias. And leaves
of Java fern become small and narrow.

What should I do now?

 

[Signus]

What's the size of the tank?
How many watts of light are your bulbs rated?
What substrate are you using?

 

[bencozzy]

looks like brown algea.

what bulbs are you running(brand, wpg,)?

also what are you running for chemical filtration? water parameters?(esp. nitrates and po4)

 

[joephys]

Doesn't look like dying leaves, are you dosing any trace elements or using any ferts?

 

[fishshl]

20 G Tank, setup for 2.5 month. substrate is creek gravel, 5mm~10mm.
Currently, 6 neon, 2 panda cory, 4 platy fries. 2 ghost shrimp.
Ammonia 0, NO3 5 or more.
I don't have other test kit for plants.

Light is very low. Only 15W.

Currently, I only want to keep the low light plants.
Now I have Java Fern, Java Moss, Afzeli, hornwort, Anubias Nana, Wendii Green
and micro sword. Micro sword need high light. It will not survive I learn from other guys.

But I want to keep all other plants. How much light need for them?

 

[bencozzy]

some thing around 4wpg should work for almost all the common plants, even swords and micro swords.

 

[Signus]

If it's been sunny lately, you could try opening the blinds to let more light in. It's not a permanent fix, but it helps!

Also, 15w is a little low for 20 gallons. Could you try increasing the light with a shop light fixture (they sell 24" sizes) and use your current bulb with a plant one from the hardware store? It's relatively cheap and you can make a hood from pine wood to cover it up. 2 watts per gallon (wpg) is about the very lowest you want to go with your plants. Good luck!

 

[rrkss]

I'm not an aquatic plant expert but looking at the picture brings potassium deficiency to mind. Plants develop brown spots which turn into holes with this deficiency.