The reason im asking this question ive got 3 x 800ltr vats for holding new ,unhealthy and young fish as ive had some good spawing over the past few years and my pond can get over stocked so until i can shift them on , What would be best yet economical way to set them up . They will hold koi and Stergon at times so needs good filteration . Ive looked at several ways ie putting a bottom drain , pump to box filter , pump with in pond filter or just pressurised filter . As they won't be stocked all year round i dont want to spend 100s and 100s but again not looking for cheapest option . If anyone can help it would be very much appreciated. it bettwe to have more heads with ideas then one all ideas will be taken on board n I thank you in advance