1-curing live rock ? what do u mean ? how should i do it ?
2-is having flow in the tank an option or must have ?
3-i think it s become abit expensive for me to buy all distilled water for the whole tank , can i use some threatment like aqua safe to make my tap water quality abit better ? ( i heard some skimmers are against the aquasafe and similar products )
4-if i cant use aqua safe , what easy way to use my tap water and make its quality abit better ? something like boiling ?
Here is my view on the above:
1). The "curing" process applies to rock that is heavy with living (and thereafter, nonliving) organisms that will die as a result of transport and exposure to air. Adding this sort of "uncured" rock to your tank could be messy--with subsequent spikes in ammonia concentration, so it is a process that should be done before any other livestock is added.
2). In my opinion and experience, it is a must-have. Good amounts of wide, diffused, bulk flow are ideal and emulate what would occur in the ocean. This stands to benefit the tank by keeping solids, like nutrient-laden detritus, in suspension to be removed by filter media, protein skimmers, and the like (and preferably removed from contact with water altogether, i.e. changing media frequently).
3). Invest in an RO/DI unit as others have suggested. It costs pennies per gallon if set up properly with good quality filters, membranes, and resins. It will pay for itself quickly vs. using distilled water. The only thing you'll need is access to a water supply and a bit of space for water storage (imagine a trash can's worth of space). Good sites for quality units include (my favorites in terms of products offered in bold):
www.airwaterice.com
www.thefilterguys.biz
www.buckeyefieldsupply.com
www.purelyh2o.com
www.spectrapure.com
www.melevsreef.com
www.bulkreefsupply.com
FWIW, these RO/DI systems are your foundation and building block for your tank. Do not skimp on this. If anything, have the patience to get this first and foremost and put the rest on the proverbial back burner.
4). See the above. Boiling only removes a bit of hardness by precipitating various calcium and magnesium salts (mainly, anyway). It will not remove the main contaminants we are concerned about.