What could be making these holes on the anubia leaves? This is a farm plastic tank with no fish, only some unwanted snails. I use ferts close to EI standard, there is also some CO2 from yeast bottles and an in water reactor.
Are you blasting lots of light? Anubias are low light plants. Having them under high light is ok but my experience is that they sometimes will tend to have this yellow tint and in some instances you'll have these pin holes which develop very early on in the leaf development. I can see some yellowing and veining in most of the leaves so this is telling me the plant is somewhat under stress of some sort. Could also be a deficiency but I would doubt that since you are dosing EI levels. Anubias grown under lower light will tend to be a darker green.