Sorry for the slow reply, it has been a couple of weeks now, I have since been dosing API leaf zone, API co2 booster and also seachem equilibrium at water changes. I have got a bit of a better reaction from the swords, one is doing alot better, one only a little better, will insert some photos. of the 2 most recent leaves on both plants (most recent leaf has less holes, prior leaf has many holes as per pictures.
Also upped light duration to 8 hours.
First 2 pictures are a marble queen sword.
Second 2 pictures are a Rose sword
The Tiger lotus plants are growing even better than they already were, I gave them a big trim back last week getting rid of all the older leaves as there are heaps of new leaves coming through... i'm hesistant to trim the old growth on the swords as they aren't doing well. Definitely appears to be a mineral deficiency but what it's lacking is beyond my knowledge.
Have just ordered phosphate, calcium, iron and copper test kits to hopefully shed a bit more light on my water chemistry.
Also added an Aponogeton undulatus and a crypt Balansae, two plants i've never kept before, just to see how they go in my water conditions.
I think I would rather keep plants that do well in my water conditions rather than having to continuously dose fertilizers just to make one or two plants happy, still interesting finding out what is going on however!