new 120Gal with 50% old water

hi i previously put a post on this but need some more info
here goes
on monday 2-21 i bought a 120 gal tank i brought back 70 gal of the water and 6 gal of the water in the 20 gal sump.i rinsed the sand in cold tap water all the water and 100pds of live rock was outside in the cold for about 3 hr.in the rain (drove to get tank)
i would like to know if tank is cycling. as i have fish in it. coral beauty,flame angel,foxface,yellow tang,blue hippo and some corals. i got a few responses, some say change water some say dont?
i put in instant ocean bio spira and also put in some api stress coat.
my fish are showing some signs of ich im now getting some algae
how long will it take for my tank to level out.any idea what to do for the ich any suggestions
ph-8.4
nitrite-0
nitrate-20
ammonia-0.25
temp-80
1.024
any help would be greatly appriecated

 

yeah, when your ammonia goes to 0 then your nitrite will increse, when that goes to 0 then your tank is done..

anytime you have cured live rock(thats been in an established) tank that has set out for 3 hours is gonna have die off..'

get some bacteria in their and dont do any waterchanges or it will extend the cycle time

 

I would do a wc do bring down the nitrates and ammonia asap. You can also use something like prime to detoxify the ammonia. Most of your biological bacteria is going to be living in your live rock and sand, theres very little nitrification bacteria thats free floating in your water column. Also, if you have signs of ich just starting, being either FW and/or medicated dips asap, and get some anti-parasitic foods or start dosing your current foods heavily with a vitamin and garlic supplement(s).

Generally, it can take 4-6 weeks for everything to stabilize.

 

for ich, as long as your fish are eating usually they will bounce back...but like last guy said, soaking foods in garlic helps with ich..

 

Gotta do the water change IMO. If you have animals in the tank and an elevated ammonia and nitrite level for the sake of the fish and inverts you should do a water change. I myself do not believe it prolongs the cycle, the fish are producing ammonia and being feed that is more than enough to keep the cycle on course.

http://reefkeeping.com/issues/2009-04/newbie/index.php

 

thanks for all the help