New leaves. All of the plants have been in the tank about 2 months maybe alittle more. The only other plants that possibly could have an issue is the tiger lotus. The swords, hygrophilia, and dwarg sag are doing great.Are those anubias leaves with the holes new or old leaves? It is hard to tell.
They look like new leaves. If they are, then I do not believe the anubias is suffering from a deficiency. If they are old leaves then it is possibly a deficiency. What are you dosing for fertilizers? Nitrates/phosphates/etc and how often per week?
How old is the anubias and how long since it started showing deteriorating signs? Are any other plants showing similar deterioration?
What is the lighting and tank size/depth?
Did you recently do any kind of algae treatment? Peroxide/bleach/excel dips? Did you use any algaecide product?
As you can see Immobile nutrients are: Ca, Fe, B, Ni and Mn affect new growth. We can quickly eliminate Ni, Mn, and probably B since they don't show up very frequently (and in nickel's case never). As long as you are dosing plantex's CSM+B you are adding enough boron.Immobile nutrients are: Ca, Fe, B, Ni and Mn
Mobile nutrients are: N, P, K, and Mg.
Variably mobile nutrients: Cu, Zn, S, and Mo.