CAangels16, welcome to Tropical Fish Keeping forum.
Prior member's posts have identified a couple of issues, and I would like to just expand a bit. First, by "pink" I am assuming it is one of the so-called "aquarium" or "plant" tubes; these are high in the red and blue wavelength and when lit tend to appear pink, and cast a pinkish/purplish hue in the tank.
In theory, these "pink" tubes should be good plant light, but they are usually far too weak in intensity. Plus I myself do not like the purplish hue, although if combined with a daylight or full spectrum tube it is not as noticeable. But the weak intensity still remains a problem, as you are running a tube that is producing about half the intensity as the full spectrum/daylight tubes so that is a considerable loss of intensity.
I just finished posting some excerpts from an article on this very subject by Karen Randall, so rather than repeat that I will post the link to that thread and suggest you have a read of my post # 20: Plant ID Help (crypt look-a-like with thick tall stem)
Actinic light is actually not all that bad for plants, but it is not the best and it has drawbacks so we do not recommend it. Here again, it is less expensive to use "good" tubes rather than these others. Less expense to buy them--and bear in mind that fluorescent tubes quickly lose intensity so they must be regularly replaced (6-12 months)--and less energy to run them because fewer good tubes will do the job. I can go more into this, but won't yet, as you mention T5 tubes and that is yet another issue. I can offer more if you can tell us the tank size and tube length.