in winter .. most windows are.. at best ..indirect light.. IF the plant is in the window ... is this its permanent spot.. ... what looks like 8 feet from the closest light ??? .. or did you just put it there for the pic??? .. where are you [how string is the sun].... and what direction does the closest window face???

and why ice cubes??? .. how cold are you making the media and roots???

water a plant when it needs water.. insert finger and find out.. and then water it properly ... schedules usually dont work out as they are random.. until you insert finger.... and figure out whats going on ...

if this thing is starving for light.. its hard to suggest you start goo-ing up the leaves thinking you have some other problem... as its the leaves that process the light into plant energy ...

so unless someone comes along and affirmatively states you need to .. lets not ...

ken