Hygrophila Polysperma - Holes in Leaves

[conorod]

I have recently planted some H. Polysperma in my tank (about 1-2 weeks ago) and it seems to have a lot of holes in its leaves (picture attached).
I have noticed a small few baby snails recently after adding a few plants - not sure what species (the only snails I put in there are nerite snails, which as I understand it can't reproduce in freshwater). But I haven't seen many, and never on that plant, so I find it hard to believe they are responsible for all that damage but I could be wrong.
I fertilise once a week with EasyLife Profito after my water change.

From googling this the other possible option I see mentioned is lack of CO2? I do have quite a few plants in there (floating water sprite, bacopa caroliniana X2, vallisneria nana, dwarf sag, java fern, cryptocoryne wendtii and the H. Polysperma) and I don't currently add CO2, but am open to doing so if it is genuinely needed for these plants. Most of the other plants seem to be doing quite well & are actively growing/sending out runners.

Does anyone have any suggestions/ideas?

 

[seangee]

Those look like they have been eaten.

 

[StevenF]

From googling this the other possible option I see mentioned is lack of CO2?

No it is not CO2. There was a time when CO2 was blamed for almost all plant growth issues. It is now know that most of the time it is a nutrient deficiency Such as insufficient calcium, zinc, or others causing the problems such as

Unfortunately several different deficiencies could cause what you are seeking or something is eating it. i cannot tell are you using any fertilizer?

do have quite a few plants in there (floating water sprite, bacopa caroliniana X2, vallisneria nana, dwarf sag, java fern, cryptocoryne wendtii and the H. Polysperma) and I don't currently add CO2, but am open to doing so if it is genuinely needed for these plants.

Take a good look at your floating plants are there any dark spots or is some portion of it yellow. If you do see some of that you likely have a mineral deficiency. Floating plants get all of their CO2 from the air. so water deficient in CO2 will have no effect on them. If your floating plant have a uniform green color you idon't have a mineral deficiency.

I put a plant in a container with fertilizer and verified it was growing over several weeks, Then I sealed the container. No CO2 What happened it stopped growing and stayed like that for a couple of months. Then it slowly started to die.

The following are considered essential plant nutrients. If any one of these is missing the plant will likely stop growing and or die.

Carbon Typically CO2 but some plants can use KH or organics for the carbon.
Oxygentypically from air or water.
Hydrogen from the water
Nitrogen
pottasium
Calcium
Magnesium
phosphorous
sulfur
Chlorine (in the forms of a safe chloride salt) not CL gas used sterilize dirking water).
Iron
manganese
boron
Zinc
copper
molybdenum
Nickel

 

[CassCats]

Usually the holes are a sign of a potassium deficiency.
Hygro is tough, and bounces back fast but also one of the first plants to show signs of deficiencies. I actually like to use it to monitor how often to dose ferts for this reason. Its a good plant!