Leafs curling up?

Well actually the leafs areant curling up, the entire leaf is pointing up.. I tried to put a pic up but my cemera siint working for some reason... Anyway, the whole leafs are pointing up so that there is a bowl shape of leaves around my top cola? They are 3 weeks into flowering and i watered them this morning...

What could be the casE?

If you don't see any leaf-tip burn, you're OK. They usually do this when things are really cooking ... proper nute level and lots of light. They're just telling you that they are very happy. If the leaf-tips are turning brown, it means the nutes are to strong.

Vi

magnesium def dude,get some epsom salt and either add 1/4 table spoon per gal,mix it with ur nutes, water. Or foliar feed spraying the tops and bottoms of leaves. U using hard water?

serpentbeast what does it mean hard water, im havin a lot of problems could be just that,the tap

I have plants do this and has not done any harm at all, see pics in indoor grow section, bangers green room, good photos aswell but its cool.