The ones with yellow and brown blotches are psedutropheus crabo (extremely aggressive), they also get to 8". Blue one and all yellow/orange one are Pseudotropheus saulosi (aggressive), horizontal black strip one is possibly an Auratus
(extremely aggressive)- cannot tell very clearly though.
Hate to say it but the tank is indeed too small for those fish, given the aggressive nature of the fish you have, you will need at absolute minimum a 75g tank for those fish when they are adults which wont be too long. You have some of the most aggressive cichlids there and they will likely be major issues in that tank before long.
They will fight each other to the death, auartus could easily wipe that tank out in a heartbeat if it decides it doesnt like the other fish. Also cichlids prefer a sandy bottom as they like to dig in the substrate, rocks and plenty of them should be the decoration in the tank, very few live plants as they will eat them.
Sorry to say but there is 100% going to be serious aggression issues in that tank before very long, once the males reach breeding age it will be hell in there. Even the females of these species can be just aggressive as the males. I can see in part of the video one of the crabo already trying to tail bite the saulosi and chase them around the tank. Magnify that 10 times and this is the level of aggression these fish are capable of producing in a heartbeat.