that is interesting thanks for the follow up I was just wondering about this tank this morning.
so to recap, the rocks covered in brown shown above, you took them out and poured peroxide right from the bottle all over the covered areas of the rock, waited 2 mins outside tank, rinsed off, put back in and in three days the rock is exactly the same as pre treatment and at no time in between did the test area come clean?
we have to test your peroxide bottle now. did you mention that you have access to peroxide locally, say at a grocery store or something or did I read you had to pick it up out of town? Id like to see pics of it fizzing on your treated rock if possible, just trying to narrow the challenge down.
we can keep looking for details to see if this is a persistent cyano attack, a nice part is that all treatments can be ran externally as opposed to test dosing your whole system. its been like this for a while now, a while longer isn't going to hurt comparatively. whatever we get to work in external testing conditions can be studied before larger application.
but you are saying the rock does come clean even through the act of simple rinsing, its the fact whatever is in the water comes back to reseed it quickly that part is becoming clear. if we have no more luck over the next few days then standard approaches for cyano can be considered, something as simple as a dedicated lights out test for 3 days can be a simple starting point that has known success on these boards in some tanks. then theres chemi clean, UV sterilization which is a prime attack for any persistent cyano invasion.
one of the details from reading the whole thread was that situation earlier in the first pages where windy ridge used the pond UV sterilizer as a critical approach in curing her cyano orange water problem. even if peroxide winds up not being a critical component of the cure we still want the clean tank after pics
your pics sure seemed to have a filamentous component that looked like an algae its quite a challenge. can you post us a picture of a test rock that was cleaned by peroxide, not manual removal, clean in the tank...and then a day later after its all covered again>? I hadnt seen a pic of the actual cleaned test rock yet, about to be overtaken. Id like to see something that indicates the peroxide can work on the target to render it clean again, and then yes Id agree if its getting quickly overtaken from something in the water column that sounds very much like a cyano or dino component which could make peroxide not rank very high on the list of common actions. UV sterilizers are very very well suited for those kinds of invasions and the sterilizers can be bought or borrowed from pond supply stores. not aquarium sterilizers, pond sterilizers. talk about a waste of time...if you are going to nuke something, do it right.
just brainstorming still, not indicating to run out and buy $300 worth of gear yet...sometimes getting a strategy ready takes a bit. for the right invader, a correct UV application can absolutely zap it gone I have used it personally several times for certain ponds and my own larger tanks. I dont run them continually, they are just part of an arsenal.
alright Ill say it which has pretty much been nonexistent in this thread
what are your tank params, and the test kits used to render them. Id like to see how the nitrate and phosphate read as the system appears pretty clean (I didnt see huge waste pockets etc)
if we are looking at more than just a surface layer invader then knowing tank params is part of a dedicated attack.