Hi, I am in the process of building a new pond with approximately 25,000 liters. I want to use a dry pump and not a submersible pump to recirculate the water. What can yis recommend I go for in terms of pump. I am handy with building things so I have built an RDF after all the views I read here and I am also going to have a moving bed followed by a Baki. Any other advice is also more than welcome.