My Tank is cursed...need help!!
 

Hello everyone, so my tank is acting up, over the last 1.5 months i noticed that my corals are bleaching, not all of them just a few,i do have a chiller and i even reduced the amount of time my lights are on,3pm till 10pm. i have checked all of my levels and they aren't bad, but i have been neglecting my tank a bit as i just started night school. So my Alk is at 8.5 and cal 490, last water change made April 30, and i do use filter socks but haven't changed them in a few weeks....like i said i been busy. i have now removed the filter socks and i am preparing to do a water changed tomorrow. Any idea of why they are bleaching??? og and my temp is set to be no higher then 80 with the chiller on

phosphate? nitrate? ammonia? inhabitants? you need to provide more info.

i didnt know those things would cause them to bleach. i will do some more tests and post the results ASAP

Filter socks could be a no3 factory, especially if not changed frequently, I change mine 3-4 days routine.
Be helpful if you post all your parameter, calcium looks a bit high, also what kind of corals,did you change the intensity of your lighting,


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What are you using for light? Could be too intense on the affected corals?

i tested all my levels, cal 490, alk, 7.9, P04-0, ammonia 0, nitrate 0, nitrite 0...i took the filter socks off yesterday. and i run T5 6bulbs. the only thing i can think of are the filter socks

What test kits are you using for po4 and nitrates? If they are truly 0 , then that's not good. If your corals are starving then that could give you the bleached appearance you're seeing.

Im guessing chlorine got in the tank from the Ro not being serviced

I had most of my colony bleached/stn from the bottom after a short getaway. I did a test right away and my NO3 and PO4 were all 0 with Hanna Ultra Low Phosporous and Red Sea N03 test kits.

I was running ULNS that time, I noticed a thick transparent slime on my sump evident that the bacteria stripped off my tank.

+1

for P04 i used both a hanna checker and salifert, for cal and alk i also used salifert and for the other i used API