i just got done building my pond an plan on using it to breed feeders so i can feed my fish i just put in it moskito fish and gostshrimp and if i can find cherry red srimp them to and i wonted to know if i can put crayfish allso or will they eat/pick at the rubber pondliner? the pond is 3 1/2ft deep x 4ftwide x 15ft long its L shape i have no idea how many gallons it is.