birds nest / monties dying...

[geckoejon]

i am having coral dropping like flies and could really use some advice. nothing has changed in my 75g. tank has been running for over 6 months with no issues until 2 weeks ago. i just tested parameters and they are...

sal 1.026
ph 8.2
nitrites 0
nitrates 0
alk 7

alk is a little low though, but not sure that this would cause the coral to start dying. i do not dose anything and no longer run gfo and carbon.

think it could be bugs or parasites of some kind????

- in the last 2 weeks i have had a dozen ricordia and yuma melt to a cloudy goo
- in the past week my birds nest have started losing polyps. several are completely white and polyp free. one of them had bee thriving for 6 months until a week ago!
- just noticed that 2 monti frags turned white literally in the last 24hrs.

didn't care too much about the ricordia, yumas, or birds nest. the montis i really like though!

all my lps, acans, scolies, gonipora, plates, and ect... are bright and vibrant! display tank is algae free it's just the birds nest, a few of the montis, and yumas/rics that have been dying. coincidence or related?

any ideas????

 

[iceet]

Your tank may be on the verge of crashing.

Your alk is a little low. Alkalinity needs to be in the proper range for the corals to use calcium. Are you dosing calcium? Check your levels and make sure they are ok. There are also other nutrients that may need to be dosed depending on the corals you have (magnesium, iodide, etc).

How is your lighting? How many hours do you run your lights every day? Could they be getting too much or too little?

Also when a coral dies, make sure to remove it right away. If not it can release toxins that can kill other corals, resulting in a chain reaction and another cycle of death.

Sorry for your losses. I know how it feels to lose livestock.

BTW this sticky is a good read in case you haven't seen it:
http://www.reefcentral.com/forums/showthread.php?t=1179702