And Welcome to NGA 
The one plant in the shell that has lighter green coloration at the center - that looks to be a signal for more light. For me I cut back on the amount of water I give if my plant begins showing signs of needing more light. I water the same time frame but less water. So if you water once per week - keep doing that but less water. Or you could spray mist around the soil and only water every other week. Do the planters have drainage? If not then there is a possibility for rotting, and black leaf tips or other discolorations can be a sign of that.
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