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I have recently ventured into a real planted tank. I have always wanted to start something small and something low tech with out the hassle of all those high tech equipment ( especially CO2 tank cause I really have no space for it ). There are no fish in there yet as I have been cycling the tank for the past 2 weeks. Just yesterday, I noticed that holes start to appear on 1 or 2 leaves of the Anubias nana. I am not sure what is wrong. Pls advice Below are my parameters,

1x Java fern ( tied to a dirftwood )
1x Anubias nana ( tied to a driftwood )
some moses. ( tied to some rocks )

4 gallon tank
HOB filter.
Temp between 25 deg to 26 deg.
Lighting 8W sunlight tube for about 5 hours daily.
Weekly water change of about 10%
Weekly dose of Sera Florena of about 2.5ml.
No water parameters as I do not have a water test kit.

I noticed some very fine wriggling worms in the water but not sure if they are resposible for the holes in the leaves. The rest of the plants are doing fine.

I want to add that the holes on the leaves are nothing like those that are eaten by snails. They first started to turn up as brown spots on the leaves and then they start to dis-integrate leaving holes on the leaves.

Hi,
The symptoms show it might be Potassium deficiency. Here is the reference:

Potassium Deficiency:
Pinholes appear in older leaves, and slowly enlarge
Yellow areas
Withering of leaf edges and tips

Otherwise, anubius is a very hard to kill plant. Are the holes appearing only on the older leaves and is there any new growth?

I have noticed on one relatively large leaves and some brown spots on 2 smaller leaves. I noticed a small leave sprouting out recently, it used to be rolled up but now it has open up further.

How do I increase the potassium?

I would wait for some time and watch the new growth carefully. I think the fertilizer you are using must have the macro nutrients. Just wait for some new leaves to turn up and if they are ok, you should be fine. The plant might have faced this deficiency at the store u got it from.
After the new leaves appear and the old ones haunt u, simply remove them!