[I got a Aqua Medic 1000 Protein Skimmer with out a pump. Aqua Medic website recommends I use a Rio 2100 powerhead with the Protein Skimmer that pushes an average of 692 GPH. If my tank overflow can only average of 300 GPH. What average GHP do I need for a return pump?Is the rio powerhead going to overpower my system? Do I have to change my overflow?]