causes of milky water in aquarium?????

so it started to happend 3 days ago that my water looks cloudy, milky like system is running for like 3-4 months and never been like that no new additions besides i switch saly yesterday to reef crystals

ph-7.8 little bit low
alk-9.8
ca-450
mag- 1490 to 1500
amonia - 0
nitrate-0.2-0.4
phos- undetecable

few frags, 2 clowns, 2 anthias, snails , crabs

sand????? its an old send from my 120 it has like 2 years and im about to go sand less?

any other ideas : ................................ imbalance, bacteria bloom ???????
 
Milky white is typically a bacterial bloom noticed when using bio pellets or carbon dosing too much too fast. Are you doing either of those things?
 
Non of those things but its most likely bacteria how long it will go on, but anyways what should I use under the rock work if I want to go sand less , any good ideas besides ugly white crate ?????
 
Just use thin sheets of acrylic under your base pieces to protect the glass of scratches. If you are not worried of scratching, you really need nothing, just be sure you have a stable stack and epoxy pieces together as required for stability.
 
It could take days or even a few weeks to go away, doing a few water changes will help speed it up. Most people who go bare bottom just place the rocks securely on the bottom glass. I agree, that light diffuser will look bad/unnatural down there, so I personally wouldn't use it myself.
 
Any ideas how to secure the rocks on the ground I have two islands in my tank(bonsai style) so I don't want them to fall hmm??????? Epoxy lots of it !11 cause the rocks are uneven ?
 
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