I need help guys

[akskirmish]

My 500 gal is having issues-I am having a ph crash.

What would cause my ph to drop from a reading of 7.4 to drop to a reading of 6.0 1 month later.

 

[oscarcrazy]

How's the live stock doing? What is your filtration and decor? Add anything new?

 

[akskirmish]

How's the live stock doing? What is your filtration and decor? Add anything new?

Nothing new has been added.Just water change last week.Ph out of tap is 7.2-So thats not the issue either.

My prized pacu looks horrible and is covered in white spots(not ick though).
Dempsey sits on bottom of tank and does nothing and barely breathes at the moment-
Severum is carring on like nothing has happened.
Same with huge marble sailfin.
Lost my huge chocolate pleco.
my 2 syndo's are fine-No signe of anything-
Clown knife looke 100% fine also

Filtered by a 150 gal sump and a rena xp-3

 

[akskirmish]

Also just did 75% water change on it as well-
Due to dead pleco.Plus it was time to due weekly water change

 

[HPIZZLE]

Also just did 75% water change on it as well-
Due to dead pleco.Plus it was time to due weekly water change

might have put it in a mini cycle.

whens the last time you cleaned the xP3?

 

[akskirmish]

might have put it in a mini cycle.

whens the last time you cleaned the xP3?

My tank has never been through a cycle.Only the beginning cycle.Tested weekly as well(water params)

I do these huge water changes weekly regardless.

Xp gets cleaned monthly.

 

[Bderick67]

Ph can drop due to alot of bioactivity. Do you know what the carbonate hardness(kH) of you water is?

 

[cassharper]

Ph can drop due to alot of bioactivity. Do you know what the carbonate hardness(kH) of you water is?

I'm curious to know what the kH of the tank is too. Very low kH can cause a pH crash, and it could take quite a while to show up. Do you have trouble washing soap out of your hair. If so, it might be soft thus leading to the pH crash.

 

[cassharper]

P.S. how long has the tank been set up?

 

[akskirmish]

Ph can drop due to alot of bioactivity. Do you know what the carbonate hardness(kH) of you water is?

I have no clue what the KH is on the tap or tank-
Can be tested later this afternoon though-I'll get that reading for you guys....