Can albino senegal bicher and dojo loach live with my fish?

i have a 3 inch knight goby, a 12 inch dragon goby, two 5 inch comet goldfish, one 4 inch gold gourami, one 3 inch silver doller, one seven inch plecostomus, one 2 inch bumblebee catfish, five inch pictus catfish. ifeed them flakes or sometimes livefoods like feeder fish and snails. i have a 40 gallon tank. i know my tank is mildy brakish i found out my fish can survive in it. my q is can a 2 inch albino curvier bicher and 6 inch dojo loach stay in my tank. i know some of my fish are aggresive cause my gourami chasses my other fish my dragon goby fought with my past predators like brown ghost knife and reedfish. im most worried about is my knight goby cause it attacked and killed my 6 inch bala shark and my 2 inch cherry barb and i video taped it on my my $6,000 hi def video camera i got as a gift. i pre orderd it and the bicher is going to be just 2 ic=nchyes will it get eaten or is it fine. i also preordered the dojo 6 inches long though im not reallyh worried cause its peaceful what should i do and im getting them on friday!!! ps im not going to give them away and i dont have enough money right now to get a new tank! also i have a crayfish in a diffrent 20 gallon tank. he there cause he ate 20 of my fish