Gfo questions

I have been having a problem with gha for awhile and would like to try running some gfo in a media bag(passively)or filter sock.My current parameters are NO3-2,PO4-0,ALK 8.0,all tests Salifert.My thinking is that there must be enough po4 feeding the algae and maybe running some gfo in this manner might do the trick,if not I may need to get a reactor for it.So I'm asking for some advise on which product might work well this way and amount to use for a water volume of about 32-35 gal.TIA,Dave

 

I think GFO needs to be tumbled in a reactor. One of my tanks is sumpless but has hang-on-back filter. I mix carbon and seachem's phosguard in a media bag in that filter. Phosguard does not need to be tumbled.

Seachem. PhosGuard

Some people say it's not as good as gfo, because it's Aluminum Oxide based which is bad for corals. I haven't noticed any bad effects. Page I linked has official Seachem's stance on the issue.

 

Thanks,sounds like something worth trying.I already run biopellets in a reactor and was thinking I just might need something to clean up the po4 a bit.Do you have any reccomendations on amount to use for 32-35 gal. water volume? Have you had any problem with it lowering your alk?

 

I believe it's better to use less, but change it more often.

They recommend 1 cup for 75 gallons.

I'd start with 1/4th of a cup and follow their instructions for testing phosphates to know when to replace it.

Also, watch your SPS for first few weeks to make sure they are happy bout it.

 

I have always used phosguard. I really don't battle with algae problems. I was beginning to wonder if it may be responsible for slower growth of soft corals but there could be many reasons for that.....

 

I like Phosban from two little fishes developed along with Julian sprung. It works best in a reactor but can be put into a media bag in high flow areas. A bit expensive but worth it.