My best guess would be either Ich or flukes. I'm also going to guess that you did not quarantine them.
More details on your tank will be very helpful.
Please include:
tank size and age 75 gallons, 7 weeks
sump? No sump since my stand cant fit one and tank cannot be drilled. Im usinf a cannister that I clean out every week
lighting Just a strip of marineland LED's, have mh on standby for later on
filtration Reef Octopus hob2000 protein skimmer and fluval fx5 cannister filter
amount of live rock Around 60-70 pounds
sand? about 75 pounds of thick grained dead sand
total flow (power heads?) About 2800 including the cannister
Are you using carbon or GFO, and if so, how? None
water source (tap,distilled,ro/di) RODI
any other livestock Nope
current water parameters (not "all good"), including, if you can, Ammonia, Nitrite, Nitrate, Phosphate, Calcium, Alkalinity, and Magnesium Ammonia: 0, Nitrite: 0, Nitrate: 10 , ph: 8.2, the rest are unknown because I have not stopped by my lfs yet to test them
Any other information about your system that you think might be important. Really, you can't provide too much
The bottom line is that regardless of where your tank is now, a QT so that your fish can be properly treated is pretty much a must-have. If it's just flukes, a round or two of Prazipro will fix you right up. If it is, indeed, Ich, then IMHO, TTM (tank transfer method) is your best way of getting through it with the least stress on your fish (and ALL fish need to be treated regardless of the problem)
hth