ok, reading about how fish can disappear have got me paranoid.

remember my sick koi??? well I have not seen 2 of them (one , the orange &
black) in several days..

don't dead fish float??? found 2 dead ones over the past several weeks, &
they were floating.....( no signs of what was wrong with them)

but after I read about, getting stuck in a milk crates.(I am concerned, we
have 3)
my algae is still thick to see the center of the pond,,, walking in it just
stirs up all the string algae.......

the pond is not torn up, so don't think, raccoons,, if IT was herons,, I
figure more fish would be gone........

ok, an suggestions???????????//

*sniff*