[mandoluce]

If you can't tell if it's over/underwatering by how wet the soil is, do the weight test. Pick up the container and imagine how heavy it would be if it was mostly full of water. If it seems light, and it's droopy, you probably need to water.

I had some problems getting my soil to hold moisture, but I bought some wetting agent from the hydro store ($5) and add 2.5ml to a gallon when the soil doesn't want to take in the water. Works like a charm and ya only have to do it every so often.

Not sure if this is applicable though lol.