So after an unfortunate accident in my reef tank over a year ago, I developed dynos which took a LONG time for me to get rid of. As I dose carbon they where the last thing to get under control. This is how I did it.
1) Filter Bags. They would clog every 16 -24 hours as I manually brushed it off rocks, ect. Keep em changed. The smell of them was horrific.
2) Manual removal. Although this helped some, IMHO this was the LEAST effective of what I did. I'd siphon any off the bare bottom (I don't have sand) and brush as much as I could off live rock with a toothbrush and a stainless steel welding brush once a week.
3) Lowered feeding. I really cut back on nutrient import for a while while I tried to starve the things out.
4) Upped carbon dosing (nutrient export)
5) Tried to raise ph to 8.6 per Randy Holmes with kalkwasser past (I already dose kalk via a kalk reactor). My normal ph is 8.1. More on this later.
6) 3 day lights out cycle.
So the most effective of all the above IMHO was a combination of the filter bags and the lights out cycles. When the lights out cycles happened on day 3 I could literally see the stuff tear off the rocks into the flow and get grabbed by the bags. The stench of the bags was horrendous.. indescribably. Makes me sick just thinking of it.
Raising the ph didnt work. For a week I was dosing cups of kalk slurry. What would happen is that the ph would scoot up then fall like a rock back down to 8.1 over the next 30-45 minutes. there was no way I could keep the kalk in the water. It would immediately precipitate out. On heaters, pumps, everything. Quite frankly, it made a terrible mess. I don't suggest trying it.
What I did find was that my ph probe had drifted over time and needed to be re-calibrated. because of this (I use ph to signal me when my alk is off and to test for alk) my alk was low.. but not terribly so. I'm not sure if upping alk by .75 dkh really impacted anything.. but it might of.
In the end starving the stuff, with 3 day lights out once a month with RELIGIOUS filter sick changing did the trick. Took forever but its gone.
Like I said manual removal was probably the least effective. On a tank my size no way I could manually remove it all once a week even if I wanted to.
Good riddance.