Bacteria bloom but nitrate are 0

[nikolamk]

Hi,

My tank is 2 years old. 180l mixed reef tank
Untill today I didn't have any problems.
Early this morning I notice some white dust in my tank. Now my tank is cloudy and half on my corals are not fully opened.

One week earlier my parameters: KH 8.2, CA 450, MG 1350, NITRATE 4ppm and they were stabile several months

Today after I notice cloudy wather I made tests and results are: KH 8.5, Ca 450, Mag 1350 but nitrates are ~0.

2 days ago I notice thah my snails emit white and I think that is sperm.
Also I have slstar fish who losing their legs and only 2 legs left , but she is still in my reef because it is alive , can this starfish should be reason for my cloudy wather?

Can some one explain is this bacteria bloom ? How this happened? Should I take future steps to prevent some coral lost ? How my nitrates from stabile 4pmm drop to ~0 ?


Thanks

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[Tastee]

Bacteria bloom but nitrate are 0

If your starfish is losing it's legs then that is almost certainly because it is starving - if your sand is too "˜clean' and there is no microfauna for it, it has nothing to eat and will start atrophying as it consumes it's own flesh. You can try target feeding it some pellets - I see reports of people able to transition them onto that.

Until it dies I don't believe it will introduce a lot of nutrients into the tank however, so it may not be the cause of your cloudy water. You could be seeing a spawning phenomenon or a bacterial bloom. Hopefully someone more experienced than me will chip in.


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