Cloudy water problems!

Gershom

Exodon
MFK Member
Sep 13, 2024
35
29
21
69
Help!
I’ve been analyzing my cloudy water problem, and it started after I got the RO system. I have a 75 gallon discus tank and have been using mostly rainwater for the last 2–3 years. That involves carrying it in buckets from the barn , where I have barrels under the eaves. Then bringing them upstairs to my study. That means my water changes have not been large. The discus have done all right, but no spawning.

Over 40+ years, I have kept discus multiple times and had a spawning pair once, but more often the discus died in a year or less. So I attributed their survival this time to the soft acidic rain water. More recently I read about discus sensitivity to nitrates, and made 2 changes:
  1. I added lucky bamboo growing with tops out of the water. This brought nitrate levels down rapidly to 20-40ppm, but generally not under 20.
  2. I bought a residential RO system and started doing larger water changes.
The discus tank runs at 85 degrees, pH 6.5, GH 40, KH near 0, ammonia 0, nitrites 0, nitrates 20, all by dipstick.

Since I started using RO water and larger water changes it wants to stay cloudy, unless I run a DE filter, and then it clears up, but comes right back after I stop the DE filter!

This is distinctly different from my other tanks, which are harder water and lower temperatures, mostly for CA cichlids. They have lucky bamboo also, and are getting the same large water changes, and have similar nitrate levels, but don’t get cloudy.

I’m not sure if it’s algae or bacteria (tan colored material in the filter), but I read that bacteria prefer harder water, which gives them “everything a body needs” (Matrix).

What is it about the soft water that is causing the clouds? Any ideas???

image.jpg
 

Flaring Afro

Jack Dempsey
MFK Member
Jan 4, 2016
62
40
36
36
Do you have a TDS meter reading the dissolved solids after the RO system? It's possible it's not filtering as well as you'd expect.
 

Gershom

Exodon
MFK Member
Sep 13, 2024
35
29
21
69
TDS measures 3 ppm on the RO filtered water!
Compared with about 140 on tap water.
But I use about 10% TW with the RO.
 

Flaring Afro

Jack Dempsey
MFK Member
Jan 4, 2016
62
40
36
36
That's almost double the TDS of my tap. I wonder if that 10% is what's doing it. I know there are products that you can add to RODI to add nutrients to freshwater but have no experience with this myself. I think Vitachem may be one of those, but don't know much about it.
 

Gershom

Exodon
MFK Member
Sep 13, 2024
35
29
21
69
I don’t see why the 10% would have such an effect when the tanks using RO “waste water” (much harder) stay clear.
 
zoomed.com
hikariusa.com
aqaimports.com
Store