[shrimpo]

I'll try to remember to return to this thread with a report on how well it grows.

I hope it will grow fine...
the green/white color of the leaves is great.

 

[shrimpo]

I think that it will grow pretty well in there.

This could be a good plant for that setup of yours shrimpo. DO you still have any of those planters left? I have often seen Diffenbachia like this one and similar among the houseplants in grocery stores or at Home Depot or wherever. They are common houseplants.

I still have one left..how large the leaves can get? do you think the light that i have right now is enough?( just 2 x 15 watts tubes) the same light that came with the tank when i bought it.

 

[shrimpo]

Are your other plants growing in that light? I understand that Diffenbachia only need moderate light, so if your other stuff is growing then it will probably be sufficient. However, 30 watts is pretty dim, and I imagine that the fixture probably has T12s. Is that right?
You might try looking around for one of these where you see houseplants for sale.

The emersed plants are doing fine so far exept the foreground plants due to duckweed plant start to cover the surface.(and possibly not enough light for them to start with)
I don't see any letters on the tube showing what type it is..so i am not sure if it's T12.

 

[shrimpo]

Well if the duckweed is growing then it's probably enough light for your other plants too.

The T12s are the real fat ones. They are maybe 1" or so in diameter.

That's the same diameter i found.