Sorry about the loss but there are several times when we get caught in the smaller details.
So let's do a soup to nuts on the ich as it sounds like the treatment left out the details.
Ich has three stages. one is a hard shell on the fish which we see but have a hard time killing. it is feeding on the fish and that means making a hole. Keep that in mind for later. Second the ich falls off and lays on the bottom in a hard shell while it multiplies. Hard to kill then, too. But when it does burst out to be free floating without protection, it dies pretty easy.
So to treat we want something in the water and a handy item to kill the easy time is salt. To get the life cycle speeded up, we can raise the temperature and the go through the three stages quicker. Gets them to the "kill zone" faster?
But there is hazard when we raise the temp as there is less O2 in warm water and that may kill fish if we don't do it right. Raising the temperature slower, over several days and watching to see how the fish react is good. Fish react different and there is no one firm answer to what is high or too high. We want to speed the ich up but not kill the fish so it is good to go slow and also add O2 in any way we can. Some things that help are water splashing by lowering the level if we use HOB, turning the spray bar toward the surface on canisters or adding airstones if we use air pumps. Add heat, add salt but also add air!!
I've lost track of how much salt is recommended, so will let others advise there if you have not read that part.
Treat at least two weeks and don't stop just because you don't see them any more as there will be some lying on the bottom, under gill covers, etc. Just don't stop until totally sure as you get to start over if you are too quick!
siphon the bottom can help as it can remove some of those but that isn't really practical in a heavily planted tank.
One thing for sure is that they are making tiny wounds all over your fish, so keep a close watch on the water quality as well as watch for any signs of fungus, etc. that start in those wounds.
Note on keeping fish? You can't be a REAL fishkeeper, until you've treated ich! It's a basic requirement.