This fall I am planning on a tropical fish pond. My plan is to transfer and Iridenscent shark, some bala sharks and other various tropicals to an outdoor pond. It will be around 2000 gallons. In this area, we have quite a few bull frogs. Is this going to wreck havoc on my tropicals? They won't be monster size fish initially, I will suspect most will be 6" plus. I haven't had tropicals in the same area as bull frogs. Any experience with this?