What to do - thoughts appreciated

[Flash]

you only have 15lbs of rock in a 75gl?

get at least 50 more lbs, let the tank cycle for two more weeks after that. then test your water. if everything is at 0 you can start a SMALL cuc... don't rush anything. no point in stressing out living things. add more rock and go from there. leave fish out of the picture until you all all the rock in the tank you'll be wanting.