HELP! Could this be phosphorus deficiency?

[Marcomposition]

Sup guys, my plant is indoors and is on its first week of flowering, these bottom leaves started to look like this:

[gbauto]

Possible.
Need pics of the plant-new and old growth.

[Rwise]

At the top of this page there is a link to "Plant Problems", follow it and find a match to your plant issue, then follow the "Read More" link and read more.
Then tell us what the PH is. Also details on the grow.