I'm looking to repot my Meyer Lemon tree to encourage better draining. I've read a lot of posts and am thinking of going the route of 1 part peatmoss, 5 part coconut husk chip. I've read that this mixture drains so well that it is better to water the plant from the bottom via soaking water up to ensure the root ball is getting hydrated. The problem with this is: My Meyer is currently in a thermo planter to ensure my rootball is kept at an adequate temperature... I live in NJ and can't keep it outside year round. The thermo planter has a heating plate on the bottom of their proprietary pot which would prevent me from submerging within a basin of water. I'm looking for recommendations here on what medium I should use for proper drainage while still allowing me to water from the top. Also, my meyer is currently potted in Miracle Grow Cactus and Citrus mix. I know this is quite possibly the worst potting mix to have citrus in, so I'm very eager to repot in a better medium. Thanks in advance!!