These Anubias ware grown in soil and have VERY strong roots & will have atleast 3 leaf's
 
Anubias can survive and some even thrive and flower under water forever. Anubias is also very heat and water parameter resistant and therefore a nice edition to Discus aquariums. On top of that fish don’t usually predate on the leaf’s or rhizome, enabling cichlid keepers to have a planted aquarium as well. If that is not enough, Anubias love to grow on aquarium décor and accessories, making them great addition to aquariums that are bare bottom or house fish that love to dig.
Anubias species interbreed extremely easy and every breeder tend to have their own hybrids on their farm and use a name they think might suit their hybrid the best. So please understand that some of the species specific information might not represent your plant 100%
With that in mind this is what I know of this species.
Description
Anubias congensis is a species of aquatic plant that is known for its unique characteristics. Some of the unique characteristics of this plant include:
Leaf Shape: Anubias congensis has large, glossy leaves that are elliptical in shape and have a slightly ruffled edge. They are typically around 15-20cm long and 8-10cm wide.
Leaf Color: The leaves are dark green and have a glossy texture.
Growth habit: Anubias congensis is a slow-growing plant that typically reaches a maximum height of around 20-30cm. It has a creeping habit and can be used as a foreground plant in a planted aquarium.
Submerged or emergent growth: Anubias congensis can grow both submerged or emergent, in the latter case the leaves will be wider and more robust.
Propagation: Anubias congensis can be propagated by dividing the rhizome or by taking stem cuttings.
Lighting requirements: Anubias congensis can tolerate low to medium light levels, but it prefers medium to high light levels.
Temperature requirements: Anubias congensis can tolerate a wide range of temperatures, from 60-86°F, but it prefers temperatures between 72-82°F
Hardiness: Anubias congensis is a hardy plant that can tolerate a wide range of water conditions, making it a great choice for beginners.
Overall, Anubias congensis is a unique aquatic plant that is known for its large, glossy, elliptical leaves and its ability to grow both submerged and emergent. It is a slow-growing plant that is hardy, adaptable, and easy to care for, making it a great choice for a planted aquarium.
Placement
Anubias is an epiphyte (plant that don’t need to be planted in substrate) and therefore will prefer to be attaching to décor. Use cotton thread as it dissolve naturally after a while.
You can plant the roots in substrate but ensure that the rhizome is NOT BURIED as this can easily lead to rot.
Adjustment.
The great news is Anubias does not go through an emersed to submerged stage IE. They don’t throw of their old leafs for new leafs when submerged in your aquarium, the existing leafs adjust to the new environment. But as with all golden moments there must be a thorn somewhere and Anubias thorn is GROWTH, Anubias is a slow grower but if you give it a good environment you can expect a new leaf every 2 to 3 week.
Lighting.
Anubias prefer lower lighting conditions, but to speed up growth more lighting is needed. BUT and this is important, they hate high lightening conditions. You will notice leaf deformation if lighting is too intense.
CO2
CO2 will help with growth BUT excessive ORGANIC material with over feeding of nutrients, can lead to holes in the leafs. If your leaf form is arrow shaped then I would recommend CO2 for optimum health.
Notes
This anubias can grow quite big so placing them closer to the back is a good idea.