Is it to much at once?

[Gary Majchrzak]

I'm willing to bet

I'm willing to bet

the skimmer needs to be properly sized and operating (to it's maximum potential) AND the feeding regimen (method, choice of foods, frequency etc.) is having a much bigger impact on the proliferation of Cyano in this case than the Pukani.

Nuisance algae (and the threat of a Cyano outbreak) is an ongoing problem we ALL CONSTANTLY BATTLE.

I use LaCl3 VERY SPARINGLY AND ONLY EVERY SO OFTEN to lower PO4 so my stony corals proliferate. If I stop dosing Lanthanum chloride I DO NOT have an outbreak of red slime. That's because I have THAT problem under control with skimming and feeding techniques.

I'm 100% positive the liverock in my aquarium is "leaching" more PO4 than the Pukani in this thread!

 

[tmz]

While I don't think lanthanum is a first choice , since it is a bit advanced and can be difficult to manage the precipitant which is definitely harmful as it clogs breathing apparatuses, the nature of lanthanum salts particularly low solubility and the years if not decades of use of lanthanum chloride by hundreds if not thousands in aquariums, including public aquariums, strongly suggests it's toxicity if any as a free metal is not significant.
The lanthaum chloride separates in the water. The lanthanum , binds to PO4 species. If PO4 is scarce it binds to carbonate ; there is plenty of the later in a functioning reef tank. The lanthanum phosphate precipitant will not dissolve at reef ph requirng an acidic pH to go into solution. The lanthanum carbonate ,if any is not going to dissolve either at a reasonable pH.

Filtering the precipitant is key ; it removes the latanum phosphate and lanthanum carbonate which are very fine insoluble particulates.Allowingteh tank water t obecome cloudy during osing is harmful.

Gary's thread on it started over four years ago ; it took me a long time and a good deal of stufdy to finally decide to use it. Now , I use it only very rarely sparingly as other methods are preferable to me but for a period of months I used it regularly on the puddle with no ill effects.; dosed slowly and carefully filtered. I've also seen a yellow tang drop in it's tracks after swimming through a cloud of precipitant in another situation.

So, anyone planning to use it needs to be confident of the method of filtration they will use and should carefully study salient posts on the thread to plan a dosing routine, ie, determine a dosing amount and method:

http://www.reefcentral.com/forums/showthread.php?t=1474839&highlight=lanthanum+chloride

It is excellent for dosing to a curing bin for rock leaching PO4 species . This out of tank application obviates the need for prefiltering,sine the rock can be rinsed before use in the display tank.
While there are likely other issues in play , I'd check the dry rock. I and others have had trouble with algae growth on pukani and macro rock and much of it does leach,ime. It depends on where the particular piece came from and how it was pretreated.
Curing dry rock it in fresh saltwater with checks for PO4 leaching and treatments along the way with lanthanum chloride if indicated is prudent, imo.