Oh the water doesn't look that bad... I wouldn't worry about that myself.
Low light refers to the fact that the plants don't need super powerful lights to thrive, and they can live without CO2 dosing. They are generally low maintenance. It doesn't mean they live in a cave.

They still need consistent light. Timers are a planted tank enthusiast's best friend.
Hi Mud! You're a handsome dude!
I would... do what
J
jaws7777
says (reiterated by Polyaddict, who did what jaws said) LOL
- Water change (use dechlorinator, avoid hose if you can just in case)
- Wait 24 hours.
- Put a whole bottle of Safestart in.
- Acclimate fish before putting them in, like with new fish.
- Skip a day of feeding, then feed lightly every other day.
- Monitor parameters daily.