I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
Your house plant should be watered when the soil is no longer moist to the touch.This may take some experimenting and watching the plant to get a feel for when it is dry enough to be watered. Low light means indirect sunlight, not direct sun, but it most likely will need more than just fluorescent lights.
For the repotted ivy I suggest you try to keep the soil a little moist but not soggy wet until it has a chance to get growing again. Try fertilizing your plants with a soluble plant foods such as Miracle Grow at the label rate every week or two for a while and they should regain some vigor and start looking good again.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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