Water actions like nutrient boosting can work, but some invasions require assistance in mass removal to succumb
it’s why I think all invasions should be hand guided out first time detected, base all water nutrient tuning on growback prevention solely, not as removal. When the two systems align in that way, it’s powerful.
If you want to start over then use live rock and create a scape you are willing to access and clean by hand, outside of tank, as the final say whenever that’s required. That change alone means you can’t be invaded again on the redo
For this tank here? We like good challenges in the threads linked above, I’d start by you removing the sandbed and we battle by cleaning out the rest. Put in cleaned rocks, cleared of detritus. Hand cleaned of invader, back on glass. No sand till rocks comply, rinsed sand goes back, peroxide treat rocks while externally cleaned. Even if you do restart, which I wouldn’t, manual attempts need to be tried here in prep for next tank invasion, practice wielding affect, and because of the current investment, with a start over its simple/always externally clean and access if needed/ but for current tank, whipping it into shape is like hittin the gym
that rascal gets cleaned out, we burn out calories vs store, force remove detritus fat, and yell at it to move faster as it sweats leaning over a rail pleading for lesser pace.
The tank cleaners are supposed to show up during the full on invasion, they reset your tank so you don’t take months for a one day event. (tank cleaners advocate taking your stuff apart and cleaning it fully detritus free and fully invasion free and waiting for nothing else to do just that)
The water tuners ideally show up after, they use artful control of chemistry and competitor balance to make rip cleaning not needed again in the future, the two systems in order equal no invasion. The two systems apart equals the current state of marine tank invasions for every reefer including my first pico reef that got killed by red algae. We should attempt to kill your invader in battle. Dental quality tank clean. No sand, calculated custom dose of peroxide on the cleaned system three times a week for one week. If that doesn’t change it, the mass itself w be greatly attacked and water tuners job isn’t ninetyfold
Do a test rock
Pull out a rock, hand clean all that off by rinsing alone and scrubbing and rinsing till clean. Pour peroxide on rock across clean surface rock let sit three mins
Rinse more
Put rock back in, it sits among the others over time so that you can look for signs of growback, or the 50% possible one off kill. Test modeling makes you take control over at least one surface, so that we can see if control works on it