ok this is just my 2 cents...
"yes i just dumped the new water in my tank"
yes, i think you know its not good to add a fresh batch of premix saltwater to the tank. should always give a new batch 24hrs to set up and get plently of air. i have to admit when i first started in the hobbie i did this also. no biggie, but should think twice befor doing it.
"I have a 45 gal
. hex. 2 months old, just finished cycling last week. I have been doing 20% pwc
every two weeks. I have a canister filter for now(checking int maybe a sump). Livestock i had 2 yellow tail damsels(6 weeks),1 lawn mower blenny(5 weeks),1 pepermint shrimp(5 weeks), and 9 red and blue hermit crabs(6 weeks), I also had green star polps, and zoanthids(both 4 weeks). I think there all about dead now except the blenny. I had a green tip bubble anenomy but at your alls advice i took that back to the lfs
. Any ideas becouse i am so stumped as to what went wrong."
sounds to me that the tank was finishing up its cycle. from my experience all my tanks took about 2 months to fully cycle and on my 55g it took close to 3 months. i dont know if you know how a cycle works, but theres alot of good links on this site that does a great job explaining it. but i think for sure your bio load was way to much for a tank so new. not to mention if u added the anenomy to the tank and by chance he got a little stressed out he could have released some toxic defences or into the water and its all down hill from there with out the proper steps to fix it.
you said you had a PH of 8.2 at 2 months old. thats great but i have never been able to do that. in fact my tank and all my tanks have never been 8.2. its always been more of a 7.9. the reason why i say this is it takes a insane amount of time for a tank to fully mature, only then the tank will start to flaten out with closer reading to 8.2.
my suggestion to you is back off a bit, look at what ya got and work from there. if ya have any fssh left keep them QT for a few more weeks. do PWC
every few days on the main tank and get things back to normal. you bioload is still weak. i dont think you lost it. it just needs time to grow. in a few weeks add 2 of your fish in the tank. and some snails and hermits. wait a 2 months and then add another fish or even a small low lighting coral ( light depending)
only thing to get out a rushing a SW
tank is a broke bank account. i learned the hard way also. LOL keep the faith up and read as mush as you can. dont worrie about all those water spec like cal. mag. redox, copper, alk
, no need for that. just purchess a good qulity salt mix and that should do ya for a FOWLR
then later down the road when ya get into those hard corals thenh you worrie about those. a good salt mix will replentish any trace elements you are lacking and should keep buffers to a good level. NEVER add any thing to you tank that u cant take out or test for. watch adding PH or Alk
buffers cause then tend to make the PH rise very very quickly and then after a few hrs it drops back to your normal reading. this causes alot of stress to your fish and inverts. then you have to QT and hey who likes to QT fish? lol
dont give up and Read read read!