Well looks like the 65 gallon bowfront is going to be the tank we use. I'm having my dad bulid a stand for the tank since he is a master cabinet maker and if I made one it would fall apart if an ant sat on it:headshake2:. With that being said I could have any size sump go underneath but I dont want to over do it. I was reading the saltwater startup and it stated that for a reef tank it should be 25x turnover so I would need 1625gph. I could go with 2 Koralia 3. I plan to stock the tank with liverock so that it's more than half way up the tank (please let me know if thats too much or too little). This is my first attempt at a reef and thats why I went with a 1,600gph overflow. I was thinking of using a 20 long or 25 high for the sump. I've never designed a sump before and thats why I've turned to you guys for help. If you think that 1,600 is too much Ill knock it down to 700-800gph. Im still in the setting up faze and the only thing Im buying right now is the tank.