View Full Version : PO4, New tank

04/08/2014, 10:06 AM
I've had many tanks over the last 12 years with struggles in the beginning but many successes(Just to add some background). So last night I finally got my 240g + 100g sump up and running after 1 month of religious work on plumbing, wiring, etc. I used 100% RO/DI water mixed with Red Sea Salt. All of the water going into the tank read 0 on the TDS meter and 0.02 on the PO4 test(Hanna). I tested the tank this morning and PO4 was at 0.32, why? Only things I can think of is that I rushed the test and the vials were wet on the outside when putting them into the hanna checker which led to an inaccurate reading or.... I put 2 chunks of myssis shrimp in the tank Saturday to kind of get things rolling which added the PO4.

All the live rock that was added was Bleached(24Hrs), Acid bathed(30Min), 2 soaks in Prime(24Hrs) each , and then Dried for 1 day. The rock then sat for 2 weeks before I did the rockscape. I highly doubt its the rock leaching PO4 due to this but I may be wrong.

To seed my tank I added 5lbs of healthy live rock, 5 lbs of live sand, and some tiger pods, all from my LFS.

I'm going to retest the tank later today and will respond back, I'm hoping its just lack of a good test.

04/08/2014, 11:04 AM
yes double check and let us know. it wouldnt hurt to run some p04 remover anyways.

04/08/2014, 01:03 PM
I agree with getting another opinion. If the phosphate reading is accurate, I'd guess that the live rock is the source, but I'm skeptical about the reading.

04/08/2014, 03:10 PM
So on the way home I figured I would swing by the LFS and grab a Milwauke PO4 checker and compare the two. Got 0.14 on the Milwaukee and 0.15 on the Hanna. My guess is things are just settling and skimmers just starting, Ill check them again tomorrow or tonight to see if its decreasing.

http://i1317.photobucket.com/albums/t621/crook671/IMG_4370_zpsa4d8b5d9.jpg (http://s1317.photobucket.com/user/crook671/media/IMG_4370_zpsa4d8b5d9.jpg.html)

04/08/2014, 09:54 PM
I did some thinking and I bet its from my sand I used. I didn't rinse it prior to putting it in the tank. Hopefully some stirring of the sand will release some of the PO4 so my skimmer can take it out. Also got my GFO running.

04/08/2014, 10:46 PM
Sand can leach phosphate, but the skimmer can't remove the phosphate directly. It'd need to be in an organic form. That's how carbon dosing works.

04/09/2014, 10:04 PM
Wow, very good point that I never took into consideration! Thanks again!

04/10/2014, 01:35 PM
You're welcome!