the ocean has various blooms and recession this is modeling exactly right. strike the right balance, corals have a boon etc.
animals will demonstrate your oxygen balances at the bottom; small movers you hadn't seen before will come out and work up on the glass towards air, fish maybe too, and that's an o2 alarm. a dead snail might cause some clouding, not sure. typically nothing happens Ive had them die in my 1 gallon reefbowl without concern.
reset any condition you need to with a 90% water change, or even possible a cheap wal mart canister filter with upgraded specific low micron filter material, or even packed carbon pellets. that w clean out tanks fast, and then you take the filter offline and clean up the tank.
hand guide your boons and busts like that, dont let any atypical condition carry on if you see animal feedback or coral closing.
**to NOT dose / experiment with new feed items that occasionally cause clouding is stagnant reefing, doing what you are doing is how someone advances the hobby. take some chances and have fun they're tough systems. I killed off about 1/3 of my 13 yr brain coral in one bad temperature move, a true hit to tissue.
slowly recovering, nearly back to normal after mos and mos of feeding uptick. the equivalent of rotator cuff injury from too many behind the back military presses heh just keep up the CPR and any condition can be reset.
you'll know when you take things too far, can effect a minor 90% water change without sand cleaning here cuz you know its likely unrelated to sand.
the snail spawning was really keen I would not have thought of that. I tend to label cloudy water as condition X and rip it out/bypass mode he he
