Can't seem to remove CP from my DT

[tc2007]

More than a month ago I treated my DT with Chloroquine Phosphate (Ick Shield powder). When I decided to take it out, I started lights at good intensity, ran carbon for 2-3 days (in a temp HOB filter). This was more than 10 days ago. There is no sign of algae anywhere (except maybe a small bit on one of the rock). I keep lights on for several hours and feed lot of frozen food etc. There is no doubt that there is still plenty of CP left over. I put 3 snails and they are all dead in 2 days. The Xenia frag just melted in 2 days.

How do I get this monkey off my back? Will 50% water changes 2-3 time in 2 weeks help? I don't have any corals yet. I suspect there is still CP on the sand bed as the snails instantly retracted and died shortly.

I also put a porcelain crab but probably will be OK.

 

[mattcoug]

I've used chemi-pure elite and had algae starting to grow w/i a few days. I suppose it would take a long time with high nutrients for a full-on algae bloom, which I doubt anyone wants anyway.

No snails in the system so can't comment there.

 

[tc2007]

I am more worried about snails and would like to add corals at some point. I will try chemi-pure.

 

[Deinonych]

Chemi-pure, Poly-filter, GFO and GAC all remove CP. Turning on your reef lights should also denature it and allow it to be adsorbed by the above.

 

[tc2007]

I had poly filter all the time. I was afraid to use it. But I will now

 

[Shanet]

I dosed my FOWLR tank with CP and did a 90% WC. After 2 weeks tried to put snails in but all died. I eventually broke the tank down because I could not keep snails or when I wanted to try coral, alive. I think the rock absorbed the CP and slowly released it.

 

[Dmorty217]

I did several large water changes to remove it from my tank.

 

[tc2007]

I dosed my FOWLR tank with CP and did a 90% WC. After 2 weeks tried to put snails in but all died. I eventually broke the tank down because I could not keep snails or when I wanted to try coral, alive. I think the rock absorbed the CP and slowly released it.

This is what I am afraid of!

 

[tc2007]

I did several large water changes to remove it from my tank.

So after removing it, is algae, snail and corals ok now? Are they thriving and snails grazing on rock and sand?