First time coco grow

Two of my plants are showing signs of bleaching, yellowing and slow growth. In my experience this is signs of over watering but I am growing in coco and have been told it is hard to over water coco. I feed my plant GH nutes with calmag, keep temps around 80 when lights are on and 72-75 when lights are on,keep rh 50-55%,keep ppm around 650 and feed daily to runoff, I use 3 electric sky 180s for lighting and my plants are 6 weeks old and are half the size of my others. Any info would be greatly appreciated. Thanks in advance.

She's awfully pale. How strong are your nutes? Are you using a schedule?

A plant that size should be fed multiple times a day to run off.
What pH are you using?

I am using GH feeding schedule. My pH is around 6.2- 6.5. I feed only once daily. I have thought about going to twice a day. Do you guys think that would help? Thanks again for the replies.

Skillcraft said:

I am using GH feeding schedule. My pH is around 6.2- 6.5. I feed only once daily. I have thought about going to twice a day. Do you guys think that would help? Thanks again for the replies.

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Which one? They have light, medium and aggressive? She looks hungry.

Drop the ph to around 5.7 for a couple days.

You’re staying on the high end of ph for coir, let it drift between 5.5-6.5.

There’s a chart a little ways down in this link, I’ve been following it and had zero problems so far. It’s for the GH trio too.

Skillcraft said:

I am using GH feeding schedule. My pH is around 6.2- 6.5. I feed only once daily. I have thought about going to twice a day. Do you guys think that would help? Thanks again for the replies.

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Try this proven schedule, reduce your pH to around 5.9, and start feeding multiple times a day to run off.

Thank you guys for the advice. I will try it and see what happens. Will keep you posted