KH best range??? what do you think &why

i have reef tank with brain coral ,montipora .tube worm ,snail ,clown ,angel ,cardinal ,tang ,liverock i read that the idle KH prameter is from 8-12 i should not go more my tank is 9 KH & calsum is 460 what can go wrong when i incease the kh to 15 & calcum to 500 is it good or bad by the why i dont have cal reactor i use KH powder puffer & kalmwsser & kent purple up i need thise carolina algae still not shown my tank temp is 27C is it ok to create it ,please help me to under stand that.& whate about magnesume addative i dont have ane test kit for mag is it enoufh with water change to puffer it ? how about the iodine whene i use it whate can go wrong with over dose.

 

It will start to snow calcium in your tank with high KH and CAL.

 

If you're going to try and keep a high KH/Cal, be sure to keep Magnesium up as well, as that *HELPS* but won't entirely prevent precipitation of Calcium out of solution.

High KH/Cal will tend to cause precipitation, especially around warmer areas (heaters, pumps, etc) of the aquarium, so it's really best to find a stable spot, and stick to it. If your creatures need higher, go ahead and try to raise them in balance (be sure to keep Mg balanced as well while you're doing this!! Low Mg will cause calcium storms!) until you reach a flatline, (Do I need to say this should be done slowly over a period of days/weeks?) where putting more additive in does not positively effect your KH/Cal, then back off from that flatline a bit, and call that your new target mark.

If you don't flatline before you hit your target, congrats, but many times, you won't be the controlling factor, the uncontrollable environmental factors in your tank will be.

 

ok i will do it slowly & monitor the parametr do you think that calcum with 500 ppm is ok or less how have tank with 500 ppm calcum? please till me about his experiance.

 

This is what I keep.
Ca 460 to 490
Mg 1450 to 1500
dKH 12 to 15

I also have a mainly SPS tank.