Hard Water Fish To Soft Water Question.

I searched on the internet but couldn't really find an answer to my question which is:

Fish that prefer hard water will they adapt to soft, I have read where the other way round can cause problems so this is why I'm asking.
I have soft-ish water where I live PH-6.5-7 and I am planning on a Cichlid setup, I know I can get Cichlids that prefer soft water but some of the hard water variety are tempting but if it is a definite no no then it isn't a problem. 

I already have 5 x tanks but I am planning on a change round on one of them since I recently acquired tank number 6.

Yes I did read those, I'm not keen on keep adding stuff to change the water, I'll stick with the soft water Cichlids, I just wondered if the hard water ones would adapt but like i said in my first post it isn't a problem, there are a few soft water ones I like any way, thanks for the reply.

Col.

Hi Sue, yes I have selected a few from that range, what I'm planning is I have a 360 Liter corner tank that at the moment is stocked with Tetras, a few Cories and a couple of female Kribs, but I am going to move them shortly in to another tank and stock this one with the Cichlids.
I was looking at possibly a couple of medium size Cichlids that won't grow too big for the tank, may be Keyholes and/or Blue Acara, not sure if they will mix or to just have one type.

Also looked at Blockhead/Buffalo/Rainbow Eartheater but they were on my second choice list, again not sure of if they can mix yet.

Thanks for the reply, I have 5 x tanks that are established but just acquired another 190 Liter that I'm resealing, so when it's finished I can begin to carry out my plan.

My big plan is next year to clean out the garage, it's full of junk at the moment but then that will be my fish room and in there I plan/dream of a much lager tank but that will be well in the next year.