Im new to ponds. I have a small pond that my father had built. Since his passing Ive been doing my best to keep the pond up. Ive got koi and gold fish in it now with a Pleco and pond snails. Afew plants that he already also. Im wanting to know what else can be put in that will survive. Ive read bout crustaceans and clams in ponds. Has anyone else dealt with these? Ive got enough fish. Dad tried red ear sliders and tadpoles but all left over time. Was thinking bout crawfish or crawdads, but heard they might attack smaller fish. ANY input would be awesome. Really wanting to add to my pond, something other than fish.