Are These Leaves Ready To Be Pruned Off My Pennywort? Need Plant Help

[Aquatony]

Hi everyone
 
This is my first foray into a living plant! It is a Brazilian Pennywort and is growing very well.
 
Here are a couple pictures:
 

 

 
And the tank in whole:
 

 
The Tetras do love having the plant, they dart around it, through it, chase each other and chill underneath it.
 
Should I prune the two leaves in the first pictures? I'm having trouble deciding when something is "decaying" and when it is healthy and should stay.
 
Thank you!

 

[Byron]

I would leave them for the present.  Once they become more definitely yellow, they are dead, and then can be removed.

 

[Aquatony]

Byron, thank you as always.
 
While I have you here, you can see I've placed an artificial plant temporarily, and I was wondering what would be a good plant to place there would be? Amazon sword?

 

[Byron]

Byron, thank you as always.
 
While I have you here, you can see I've placed an artificial plant temporarily, and I was wondering what would be a good plant to place there would be? Amazon sword?

 
You're welcome.  Yes, an Amazon Sword, but these can get large, easily filling this tank and I mean filling.  Sometimes they are slow to do so, and it depends upon light and nutrients.  But still worth trying.  Another plant you might have good luck with is Vallisneria, the small "corkscrew leaf" species.  I can't remember what your GH and pH are, but unless it is very soft Vallisneria should manage (it thrives in harder water).  And the small so-called chain swords, Helanthium tenellum, the pygmy chain sword, makes a nice lower plant; it too will send out runners everywhere.  Probably would do better in sand (I believe that is another tank planned?); I've had Vallisneria in pea gravel and fine gravel.

 

[ChadAT]

No need to trim those leaves yet. When a leaf is rotting it'll generally curl and turn yellow. You'll notice the yellow colour run down the stem the leaf is attached to. That's when you pull them out. 

 

[mark4785]

You need to look for the leaf turning yellow and then prune it. The leaf will turn orangey/brown afterwards and will have a mushy texture so be sure to always prune before this happens.

 

[cooledwhip]

Wow is the pineapple a live plant too?

 

[Aquatony]

Wow is the pineapple a live plant too?

Hehe, no of course not, but you knew that. 
 
That is for my 5 year old son, same with the volcano, it is his fish tank.