I see the nice white color of your roots is a response to the black pot. I've been using clear pots wrapped in duct tape and I was still getting green roots on the edges of the pot. I double wrapped the pots and presto white roots again. One layer of duct tape still allowed light through and caused algae to grow. I don't know if it caused me any issues with the plants but it can't be the best conditions for the roots if they're turning green. It would probably limit growth and negatively effect their health in one way or another.
Pots are not transparent for a reason, going cheap has probably cost me more in duct tape than proper pots would have at the begining.