From looking at your photos I can tell you with experience that Ocean Forest and Happy Frog could have been the root of your problem.
Looks like you used the soil right out of the bag, Ocean Forest runs really hot with Nutes and it is highly advisable to cut with lots of perlite, vermiculite and or coco. Happy Frog is milder but you should cut it as well. The shit retains a lot of water and can water log your plants easily if not cut as well thus suffering over watering, Nute lock out is notorious as wel which looks like you had a case of. Don’t get me wrong these are both great soils, but with a little amendment it can be better for your plants and retain greener foliage to the end.
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