Anubias are better grown attached to decor rather than with the roots in the substrate. They have a rhizome, the thick root like thing which the leaves grow out of, and this rots if it gets covered. While it is possible to plant just the thin hair like roots with the rhizome on top of the substrate it would be all to easy to accidentally cover it. Mine are attached to wood.
Your photos show the rhizome still buried.
Some plants are root feeders, some are leaf feeders.
Amazon swords are greedy root feeders so they need roots tabs pushed into the substrate near the roots, and new ones put in at intervals. The instructions will tell you how often.
Anubias are slow growing leaf feeders. They need tiny amounts of liquid fertiliser, a lot less than the instructions say to use.
Flourish Excel is a liquid CO2 product which contains a toxic chemical - glutaraldehyde. This is also used to sterilise heat sensitive medical equipment and in embalming fluid, amongst other uses. Even a tiny overdose can kill some plants and it is not really the best thing to add to a tank with fish.
Some fertilisers are better than others. None of them contain everything plants need but some brands contain more than others.
The most highly recommend liquid fertilisers are Seachem Flourish Comprehensive Supplement, Brightwell FlorinMulti (in the US) and TNC Lite (in the UK).
Some root tabs release nutrients into the water column so those are best avoided. Again, Seachem Flourish root tabs are usually the recommended one.
Now I was wondering do they look like they’ve been planted correctly. I have seachem flourish was wondering if I had too add some in.
