I'm wondering if this is coincidence.
Do you have an empty tank you can try an experiment with?
If you do, fill the tank with dechlorinated water and dose it to the PPM equivalent of what you dose your main tank. Do macros one day, and micros 24 hours later, and see if this happens.
Yes, I do, but do you think I would get the same result with no plants in the water, no filter, no fish, etc?
There are two ferts you arent supposed to dose at the same time because they form a precipitate that cloudy's the water. One is iron, my memory is fuzzy but I want to say the other is either phosphate or potassium.
It is recommended you dose one in the AM and one in the PM to avoid this.
From what I understand, it is Phosphate and Iron that cause cloudiness. I dose these on alternate days, but it's possible there is still enough phosphate remaining the next day that it reacts with the iron. This is why I figured I'd experiment with dosing only K on macro days to see if it clears up.
Looks like green water, could also be a bacterial bloom... pour some water in a white bucket and Iím sure it will look green.
If itís green water a UV sterilizer should clear it up in 2-3 days, keep it running just in case for at least a week. Once your plants adjust and start using the ferts, you should be ok. You started EI all at once, your plants need some time to adjust to a change in environment ie nutrient rich, once they adjust and start using the ferts they will outcompete the algae bloom. You can also try cutting down to 1/4 or 1/2 EI.
If itís a bacterial bloom, just keep up with water changes and it should go away on its own.
I dose micros and macros on same day on many occasions and this never happens.
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It looks green because the light was low when I took that picture and the reflection off the plants. It is a milky/smokey white. I've already cut my dosing to 1/2 EI with no improvement, so I'll cut back even more. I thought LESS water changes was better for a bacteria bloom???
Some don't have issues, others do. Not sure what to say about that. I do know plenty of people do have cloudiness issues when starting EI. What size tank do you have? I think 20 gallons is just a little too small to keep things stable. I've been dosing my 60 gallon every few days with the same mix, but no nearly as much as my 20 gallon, and there is no cloudiness whatsoever.