I've got a lady that has a rickety looking fish pool. it leaks and she wants a new liner put in. here's my trouble-she had tried taking fish out before and had no luck-they all died. i asked how she did that and she stated she used the same water from the pool in the container, put stress tablets in the water, aerated the water, but the fish still died. the fish she has currently are koi and goldfish hybrids in a pool that is fed by a natural spring. they are about 4-5" in size and she doesn't want to take them out if these are gonna die as well. any ideas on how to remove them?????