i'll let you decide on what to do but here are the facts.. 2260 = 1260 pump with 635gph comes only 1" and 5/8" tubing.. now the upgrade that eheim did with 2262 = 1262 pump 900gph but now you get the two double tap connectors so cleaning the filter makes it easier.. back then when 2260 came out you have to purchase the double tap connectors separately which cost about $80-90.. facts are done.. it's all up to you on upgrading to a more powerful pump.. or just get the third filter 2262.. just like i said before shift the current 2 x 2260 to one side of the stand and you'll have room for the sump.. don't it get dull cleaning your 2260 (hope you have the double tap connectors) filter every so often..i takes me about 45mins to clean my 2260 but i upgraded all the necessary components to 2262..is your tank footprint 84"x24x30"h?? anyhow good luck...