I am looking a purchasing a 610 gallon long setup to replace my 125. Planning freshwater with rays and a arowana. Plan for filtration was a 70 to 125 sump with a aqua lifeguard I thank that is the name (pond filter) plumbed in. However when I called to order the tank and stand the I told that I would be better to go with high quality canister filters for freshwater setup because they need more water movement and a closed system. Has anyone found this to be true he also stated that I shouldn't get overflows. Any suggestions or opinions would greatly help