OK ... please dont hate me but this might come across as a bit rough
1. I've been reading a bunch of posts by you lately and it seems like you have no idea what fish you really want to keep. Thats ok... it took me forever to decide.
2. If you are going to ask questions you should be prepared to hear answers you dont like .... thats ok too everyone has a differnt opinion ... thats what makes the world go round
so that being said
Please take your clown back or get the 55 now. He needs friends. He needs more room. I know you love em but you really should consider the welfare of the fish. I have a 55 and wouldnt keep clowns because of the size and needs... I got kulhis instead.
I have not kept convics but a friend did, several years ago. He said they were agressive and killed everything else in the tank (I dont know what the tankmates were though).
Think carefully about the fish you have and what you want your longterm fishie goals to be. It costs to much in cash and headaches to get fish on impulse then decide you cant keep them and have to take them back or have them die or have to get new tanks and supplies all the time (well the last one isnt so bad
) )
This is the rule I try to abide by when making purchases: First the tank THEN the fish... meaning RESEARCH, RESEARCH, RESEARCH then get the setup perfect then make the trip to my favorite LFS for the fishie ...
The wait has ALWAYS been worth it ... I have lost a very few fish to stress or disease.
I hope this can help... good luck