Normal water change gone wrong

[Popeye]

So I did my weekly water change the same way I've Allways done it. This time half of my corals closed up and look like crap. Everything kind of has a white outlining on it.
The only difference was after mixing salt in Rodi water, I noticed next morning pump was not working so I replaced with new pump and continued to let mix for another 5 hours before water change. Usually 24 hrs of mixing.
After I was done I noticed some stringy, slimy stuff kind of stretching from coral to coral (I've seen this before, just not as much).
Waited a couple of hours and tested water. Perameters were normal except mag. was a little higher than normal.
Alk 9
Cal 420
Mag 1470
PH 7.9 a little lower than normal
Ammonia 0.25 usually 0
Nitrite 0
Nitrate 0
Phos 0
55 gal dt
20 gal sump
Lots of cheato. Bubble Maggus curve 5.
Media reactor with carbon and gfo.
Reef crystal for salt.
Anyone know what might have caused this?

 

[Popeye]

 

[reef lover]

Could b a reaction to the ammonia amounts...any idea as to why its present? Did something die?

 

[Reefer1978]

Is the new pump brand new? If it's used could it have some dead matter inside it? Algae, etc.

 

[Popeye]

The pump is new, only used it for a week on my media reactor. I did have a chunk of coral die two weeks ago and skeleton is still in tank.

 

[Reefer1978]

Hmm that still doesn't explain ammonia

 

[Popeye]

About a month ago I started using marine snow.

 

[reef lover]

I would stop feeding fine particulates for now, and do another water change as soon as u can.

 

[Popeye]

Ok

 

[cb684]

I would not do another water change, it will only cause more stress. I would add some prime and potentially start with GAC with a low flow (1 x tank volume per day).

 

[Scurvy]

Was the pump you mixed the water with the one you found not working the next day? Maybe the new water wasn't mixed well enough? My PH usually goes right to 8.3/8.4 after a WC.

 

[Popeye]

I would not do another water change, it will only cause more stress. I would add some prime and potentially start with GAC with a low flow (1 x tank volume per day).

GAC?

 

[Popeye]

Was the pump you mixed the water with the one you found not working the next day? Maybe the new water wasn't mixed well enough? My PH usually goes right to 8.3/8.4 after a WC.

Possibly, but it looked clear with no salt at bottom of barrel

 

[Scurvy]

Sorry misread that you found the pump not working and continued mixing afterwards.

 

[cb684]

GAC?

Granular activated carbon. I normally use ROX from BRS.

 

[Hans-Werner]

Has the defective pump any visible damage, maybe inside?

 

[Watevadog5]

Read my mind Hans... Pump stopped , maybe some rust or trace metals in the water??

 

[Popeye]

Has the defective pump any visible damage, maybe inside?

Good question I'll check when I get home

 

[klp]

Buy some new salt and keep the old salt as a reserve if no other issues found elsewhere. Do a series of water changes maybe 3 25% over a week or so. Something may have been way out of whack with your salt, a contaminant etc., all else being equal. Check salinity at LFS if possible to see if your instrument is off. Sounds very frustrating when you do everything right and it blows up on you. Good luck!

 

[Popeye]

Sorry it took so long to respond. I waited for next scheduled weekly water change instead of right away like some mentioned.
Corals were slowly coming around before said water change. But my weekly wc brought everything back right away. That being said you guys were right, I should have changed water sooner.
So, it was either bad salt (wich I tossed out) or something to do with pump crapping out in mixing container. I'm thinking more towards pump since I used same salt in previous wc. Too much money invested to chance it though.

THANKS!!!