Ok, some of my tanks are crashing... they are fine one day, and the next, totally wrecked. Yucky & Cloudy. I was so bewilldered as to what was happening.
At first I thought that it was overfeeding, so we cut back. Then we thought it was too much light, so be backed down, then we thought that it may be too much phosphate, so we added a filter pad... nothing.
I tested and re-tested... all readings were normal or zero... or so we thought. Today, just for a ... let me just see something idea... I used a dip stick to confirm my testing, and BINGO... my nitrates were all wrong... I was getting 0 nitrate readings with my API, but the sticks were all much, much higher. But I never thought that someting could be wrong with my test kit.
So, yes, the tanks that are crashing all have significant nitrate, around the 60 mark, the worst one at 80. The good news is that as soon as the tank clouded, I was water changing... however, because the problem is too far gone for a quick fix, the water remains cloudy for about a week or so before it regualtes.
I think I got into this trouble because after my weekely test, I would either 10 or 20 percent waterchange... so when the tests came out fine, I was only doing 10 percent changes... and I thinK this is where I made my mistake.
Am I way off track here or what? All this crashing is bringing down, Ahhhh... I feel like crap.
(at least the fish dont seem too worse for wear... at least from the outside, no illness or problems I can see).

I dont know if I should be mad at myself, or just sad about the whole thing...