It's all normal, the brown is diatoms and always the 1st part of the ugly part of a tank. Once completely cycled I've found cerith snails very efficient to clean the brown. Don't overload your tank with a cuc, add only as needed; they need to eat. When the green algae starts to come(and it will), add some different snails like astreas to clean that up. Don't follow the # of snails per gallon, only add a few then more if needed. If you overstock your tank with cuc when the food runs out they will die, and cause more problems. No need for nasarrius snails until you are feeding fish and they have left over food to eat, and at this stage a conch will most certainly starve.
The blue slime is likely sponge or something dying off, just take a turkey baster and blow it off. Keep your intake and pads clean off debris being filtered out.