On a possibly similar note, Algae-Fix by Pondmaster is listed as being unsafe for invertebrates because I believe it contains copper. However, I've used that per instructions on our circulating pond-plant sales tanks at work, even with the trapdoor snails in it, and didn't notice any that died from it. If anything they were just as happy after the treatment, and continued to reproduce that year. I believe the warning is more leaning towards invertebrates such as crawfish and shrimp, who are incredibly more sensitive to the element.

Personally I'd send back the block, and use the snails by themselves, and realize that especially with the introduction of the little guys, the pond's just going to have to balance out. Maybe add some floating plants that die off in your zone's winter to shade the water a bit, or barley straw to tanin it up (though that seems more effective in larger ponds).

Jordan,

Thanks for the response. I have tried the barley straw (last summer) and it did little or nothing for us. My intention never was to use the Pond Block and the snails at the same time. I had just put the blocks in a few weeks ago and in the mean time decided to go the snail route. I hate putting chemicals in especially if there is a natural solution. I took the blocks out and tossed them, they were only about 20% dissolved. I think I will just wait a few more days as I did a water change and we have had a lot of rain here the last few days helping to flush what chemical still remains, so it will probably be safe to put them in. I'll also plant some lillies or something to help as we do get a lot of direct sun. Thanks again.

Ryan

Ryan, if you had heavy rains you might want to do a PH and Buffer test. Sandy

Sandy,

Great point. Will do first before I acclimate the snails this weekend.

Thanks,
Ryan