What the hell is this on my sandbed

[hamannbmw]

it doesnt looks like cyano leh... cos its deeeeeeeep purple in colour (almost black) , and it starts to crumb up my sandbed on the leftside of tank

from the pic , it shows 2 patches

[RAV-65]

Bro, from the pic I tink it's cyano... maybe try giving the problem area more flow??

[blueheaven]

I had something like yours

But mine is the sand clump up and coralline grows on it

[Eric]

it doesnt looks like cyano leh... cos its deeeeeeeep purple in colour (almost black) , and it starts to crumb up my sandbed on the leftside of tank

from the pic , it shows 2 patches

Ya its cyano.............feed less, more flow & frequent water change will help.

[Gouldian]

That's the red carpet alright.

Get ready to be treat like a VIP!

[weileong]

welcome to the club

But your new toy will fix that

[hamannbmw]

lol... really cyano arrrrr , i thought my cyano stage over liao, cos last time the cyano is reddish in colour... walau didnt know cyano comes in deep purple

Anyway, thanks all for the ID

[Kelmen]

cyano got many color; black, purple, magenta, green are all I read from various posts.

In your case, I would suggest cover the spot with something, quite easy.

Blocked the light to it, give it a go at least 1 week. Once you removed the covering, no more bubbles. Well, it may "revive", but I believe you can purposely place a cleaner critter on the spot try to eat them.

My sea cuke seems help in it.

Noted, the covering purpose is to prevent it from spreading on the spot. You have to carry out many sugggestions from others suggest reduce feeding etc.

HTH

[wil_lee76]

welcome welcome....time for war! anway,checked ur po4 and no3. montior your feeding and even lighting period. should help that...put rowa to lower your po4 if it shoot high....part of parcel in reefing...