So , this is an Oceanic Biocube 14 , now rimless. And will get koralia 240 , so should I upgrade stock return pump ? And as of now there is a 48 inch t5ho fixture with 1 actinic 54w ati and 1 12,000k 54w ati , any thoughts or suggestions being that it is a 4 foot fixture over a tank no wider than 15" . I plan on a reef tank with a clown and maybe a goby. Or two and shrimp. Any suggestions are welcome! Thank you!