Yes I do use fertilisers and CO2. My amazon swords were probably the plants that were suffering the most before I started using plant targeted additives. I'd more or less given up with them and planted the hygrophilia in the middle of them all. Then when I started using CO2 and fertilisers they came back to life and are now doing incredibly well. I do have to fairly regularly prune back any leaves that look past their best, but there are always up to a dozen, usually small new leaves ready to take the place of the large old ones.
I bought a JBL CO2 set that included fertilisers. I had a few long conversations with Natalie on the old board about plants and different fertilising techniques on the old board. I'm going to have to try and have the same conversations again, as I no longer have those posts for reference!
My tap water is rather on the soft side (though not really soft) as we're on the edge of the Peak District (where a lot of peat is still cut). It is also incredibly low in nitrates. And with a lightly stocked tank, my current fertilising regime includes adding calcium nitrate at water changes! It still feels odd to be adding nitrates to my tank.

But the improvements since I've started doing this have been outstanding. The plants look loads better and I've had fewer fish deaths.
I was worried the hardness of my water was creeping up, so did a large water change and didn't add any fertilisers. A few days later, I had a significant algae bloom that took several weeks and water changes (with ferts) to get rid of! But I didn't have to do anything extreme like blackouts. Just resume fertilising.
Interestingly enough the other plant that seems to have benefitted significantly from CO2 and ferts is the vallisneria. I am still clearing out the snails that boomed during a few months of neglect, and they're some what fond of the vallis, but it is growing quickly enough that it doesn't really matter. I just have loads of half eaten leaves to keep picking out! My vallis is supposed to grow to about 50cm tall, but I would say it manages at least twice that.
At least half the credit for the success of my tank at the moment is due to my husband. He does an amazing job of emptying buckets of water I have siphoned out of the tank as well as pouring the new dechlorinated water back in. And as a small water change tends to be 30l, more usually closer to 50l, it is no small task.

I don't think I've had the opportunity on here before to say how much he is my superhero.

Got to go and do a water change now before it's too late and my superhero loses his super powers!
