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You'll be fine, coco naturally has a high pH around 7-7.5, it will also depend on the brand if it has been thoroughly rinsed, a lot of times it will still have salts in it as they dry/process it by the ocean/sea. (a lot of brands have gotten better about that)
You can use 5.8pH to water, but keep giving 5.8pH water/nutrient solution and you should be fine, I have grown in coco and never checked run off, as long as you put in 5.8pH everything should be good, later in flower they will like 6.0-6.2 on some strains.