 too much too soon
Too me it seems you have put too much in your tank too soon. The slower you go the easier. Your 125 seems to have quite a load for 3 months old. Assuming you dont have any coral in there algea will not hurt anything and with time you can probably "wait it out". The reason algea is there is because it is consuming the nutirents nothing else in the tank will, or will fast enough. Give it time and others will out compete, algea is low on the totum pole.
As for the ich, you could do a quarantine tank but that is likely to stress your tang even more and increase the chance of mortality. IMO if he is that far gone, he is gone. The best treatment for ich in a reef system is to eliminate as much stress as possible. A fish that is not stressed is likely to beat ich on thier own, assuming he is not too far gone.
So in conclusion, if it were my tank I would let things be, feed minimal (dont let them starve), and wait it out for several months, count your losses as lessons learned
MHO, I have only had a reef aquarium for less than a year but have been an aquarist for 20+
Good Luck
Travis
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-125gal,, Odyssea 4x96 2 actinic 2 12000k with 12 led moonlights, Odyssea 1000 return pump, SCWD powered by Odyssea 1000, Coralife Super Skimmer 125, 250 lbs sand, 121 lbs of live rock, galaxia, green polyp leather, xenia, frogspawn, goniopora (oops), bubble coaral, hydnophora, multiple polyps and zoas, Yellow tang, mandarin, yellow tail damsel, cleaner goby, lots of snails, 6 blue leg hermits, 2 peppermint shrimp.
-55gal soon too come reef |