tank is 2.5 months old coral only after my one survivor decided to go carpet surfing a day into the new setup..
Very new tank. Almost certainly too new to take fish.
Stick with only the CUC (diversify it like Salty said) and corals for at least a few weeks.
Once things seem to be more settled and algae is under control then add another coral or two. Ideally placed them in those spots where algae was growing. A few weeks after that (which should be "months" from now) consider adding 1-2 new fish at most.
Corals are only being fed once a week if even that
Stop coral feeding. They will use currently available dissolved nutrients, eat any remaining detritus, etc and be GREAT.
By way of contrast, it's very unlikely they're eating much of what you're putting in the tank for them....which means coral food is mostly just polluting the tank and setting the stage for bigger algae blooms.
there is some overfeeding
Stop any overfeeding – not helpful unless you enjoy algae blooms.
Adequate, regular feeding is the ideal. If "regular" is a problem for any reason (like maybe you work), don't hesitate to use an auto-feeder for help. But don't make up for anything by over-feeding.
I'm also running 50g of Phosban
GFO is something to be avoided in a new tank that is still maturing. You
want detectable PO4 and NO3 in a tank this young. (
Not near-zero or zero for either one.)
The best nutrient control at this early stage is to
control how much you're putting into the tank – limit BOTH livestock and food to appropriate amounts. This prevents the need for anything like you're doing AND grows a healthy tank with naturally limited algae.
Other than that, at this stage you should only be using live rock, a protein skimmer, a healthy CUC and some water changes. That's it.
Limiting Dissolved Nutrients
Limiting dissolved nutrients is a
weak control against algae anyway. But it's a very effective strategy in a new tank for causing
bad/nuisance algae to grow and to be favored vs good algae.
If you choose to limit dissolved nutrients with filter media or carbon dosing, wait until the tank is very mature – at least a couple years old.
In the mean time your whole microbial food web in the tank is trying to mature but being compromised by the reduced level of P and and the general nutrient imbalance thanks to your selective removal of one nutrient but not the rest of them.
