What is the stock in the tank Alan? I am worried because you said big fish, lol. Typically the apple snails grow pretty darn quickly. Most of the ones I have avaible now are dime sized. They are purple, magenta, and chestnut (burgundy) striped. I sell them for $3 a piece. Shipping for up to 6 is $4.80, over 6 is flat rate of $9.80. I individually bag them for shell preservation and each snail is shipped with a small piece of plant to cling to. If the bigger fish are cichlids, I probably wouldn't recommend adding apple snails. Right now I am recovering from a complicated knee surgery, I should be able to ship again in about 2 weeks. I think you could expect the apple snails to reach golf ball size within about a month of receipt, but it really depends on temp (higher temp, faster growth but faster metabolism and consequently shorter lifespan).