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Try adding Nitrogen and Phosphorous. None of the products you are using contain these so your plants are disintegrating, hence the surface scum. If you just add the amount of EC it says on the bottle you should be OK for carbon. It also depends on your lighting level. If you have a lot of light...

The first time you run water through I've notices the water takes on a blue-ish tone. Probably just a bit of carbon dust. I've never worried about it and figured a bit of internal cleansing wasn't going to hurt. That aside I wouldn't bother using it for tank water, just get a decent water...

10ml + 90ml = 100ml = 1/10 L

Once the fish have initially been aclimatised to tap water I don't see any problems. I've performed two 80% water changes in a row on several occasions with no ill effect. Fish seems to be a lot livelier afterwards.