The plants that you say are doing OK are the ones that are low demand and will do well in most aquariums. Beyond that you will probably need specialist lighting, substrate and injected CO2
. Amazon swords and crypts are other plants that are low demand and will do well in most aquariums.
Essentially if plants do well, keep those. If they dont, remove them unless you are prepared to do whats necessary to provide for higher nutrient, light and CO2
is on the low side. Most of these commonly kept aquatic plants use KH
for their carbon needs and not CO2
. You might consider something to buffer the KH
, or more frequent water changes to replenish it if your aquarium is chock full of plants and KH
is getting depleted.
A word about excel. Liquid CO2
additives are poisonous to fish. Its gluteraldhyde, which is normally used to sterilise medical equipment. In aquariums it acts as a mild algaecide, and provides zero CO2
. You have to be careful not to overdose, its a fine line between no real harm, and killing everything. Due to the negligible benefits, is it really worthwhile dosing this given the risk? These CO2
products should be removed from the aquarium hobby IMO
, they offer no benefit beyond a small algae control.