Change of Plans?

I was just thinking:

The Great Salvania vs the Elodea= Floating plant vs Floating plant

If you don't get what I mean, I'm saying that it wouldn't make too big a difference if we use both of them. We should use something like:

Floating plant vs Fully Submerged plant.

However, if we do that, it means that we'll be needing a medium(e.g. gravel) to hold down the Fully Submerged plant. This will pose as a problem to our male betta during spawning, he would find it difficult t0 retrieve the eggs that have sunk to the bottom of the tank.

Should we use :

Floating plant vs Plastic plant instead?

At least we can use something else to hold the plastic plant to the bottom of the tank (they usually come along with suction pads) But if we do it this way, we'll sort of be measuring 2 variables at once:

Floating,LIVE plants vs totally submerged PLASTIC plants.

What do you all think?

Haha, we could anchor it sideways on the side of the tank...