55g fit for Bimac? (newbie)

[needyreefer]

I have had a 55g reef tank now for about a year (with success) and would now like to try something differrent. Im willing to break my tank down and get rid of my fish, corals, anenomes, and etc. to go the octopi route. In my tank I have about 75pds of live rock and about a 1and a half in. sand bed of argonite and bits of crush coral. I am running a canister filter, the Fluval 404 with activated carbon and bio-max. I have an Aqua C Remora protein skimmer with two maxijet 295 gph power heads. Also i have a 265w Custom Sea Life PC fixture(2 10k bulbs and 2 true actinic) with moon lighting.

Now for the questions/concerns

I would like to keep a bimac in my tank but the depth of my 55 is pretty narrow (13.5 in) is this ok, especially with 75 pds of live rock? Should I make more of a rubble zone with my rock or higher archs for caves? I will be removing the crushed coral that I have left and lowering the temperature to 72 dg F. Should I keep my pc fixture and convert the bulbs to 20,000k bulbs or put on the old strip flourescent fixture? Can I keep my sand sifter star and brittle star?

Am I forgetting anything? How does my setup sound? Anything more I should be aware of or know? Also how big do the bimacs actually get?
Thanks for any help,
Patrick

 

[OctoMonkey]

A 55 can do a bimac but the 13.5" is going to be a squeeze... some of the larger bimacs have had 24" arms!!!

Once a bimac gets larger the rubble can be a danger to a tank so start off with a lot to mak ethe octo feel secure but be prepared to take some out when it grows.