First let me say that excel isn't a fert persay, it is a source of liquid carbon. here is a very educational thread on ferts and what is called the EI concept of fertilization; https://www.plantedtank.net/forums/sh...d.php?t=517945
Also one on dosing recipes by the same poster as the first; https://www.plantedtank.net/forums/sh...d.php?t=647697
Given that your not injecting CO2 gas I would suggest starting with 1/2 the recomended EI dosing suggestion, one can always adjust from there.
Personally I've read often enough that the PPS method often lacks in areas and through that lack sets the stage for nusiance algae and IMHO the EI concept is the way to go.
Green Leaf Aquariums is a good source for ferts, that's where I got mine from, however this poster has a better deal for the same ferts, wish I would have gone with them myself; https://www.plantedtank.net/forums/sh...d.php?t=690881
For those swords your going to want to get some kind of root tabs as they are heavy root feeders. The posted I linked above also carries those, or you could get the Flourish root tabs, either will work but the osmocote+ capsules are more cost effective in the long run.
Also there are people who run sponge filters on their planted tanks. Things like air stones and such only come into serious consideration if your injecting CO2, then the concern is for off gassing the CO2 your trying to inject. Actually in the absence of CO2 injection it is said to help balance CO2 in the aquarium as surface agitation can cause gas exchange for both O2 and CO2.
The bio-wheel isn't hurting anything, and maybe my brain is sleeping but I'm unsure as to what your post is refering to as AC as it relates to a filter. A hang on the back type filter or in your case what's called a power filter can be adquate for filtration, however I have found that they lack in providing adquate flow throughout the tank. One could suppelment this by adding a second filter such as a canister filter with a spray bar or jet discharge and project the flow length ways down the tank, or one could add just a powerhead. Either way the goal is to avoid dead spots in the tank as it is in these dead spots that not only can algae grow, but nutrents from the ferts are not being adquatily distributed.
Hope that helps