I can’t use hydrogen peroxide because I have eels and loaches. I put in a lot of phosphate pads and 300grams of Purigen and it’s a bit under control. Now I’ve Just got green dust algae but I’m slowly doubling my plant biomass using wisteria and rotala bloodii, fast growth hopefully out compete the algae and allow for dosing before I replant the plants I want.
So hard and slow to turn around but I will get there
Ok so pull your loaches and eels into a bucket, with tank water, and a bubble, maybe take some seeded media out and add it to the bucket.
Then add the peroxide, leave it for 30 mins ie while you scrub everything, then immediately do a 50% water change and add your soft skins back in.
That gives your tougher fish 30 mins bath in the peroxide.
Trust me this works. If you want to test on yourself to see what happens, go to work, do not take your shoes off all day, do not shower when home.
Mix this solution and dip your feet in it...... You will have the most cleanest, bacterial free skin possible.
I have done this for years, that's why I can't remember where I found the calculation, but it works.
If you are worried, just remove all fish, add the solution, scrub the tank and all ornaments, do the water change, then add fish back.
To be fair that's safer if you have the room for all the fish in the tank.
I can tell you flowerhorn, pleco, sail fin pleco, bristle nose, and the mostly black L number catfish, I have had lots of zebra/lighter colurs die I don't know why, but i confident with what you see in my tank, they all survive.
The reason I am saying to treat the whole tank is because the algea spores can get trapped in the filter and release more after.
Also don't worry about the jokers that are going to jump in saying that this will destroy beneficial bacteria......
YEASHHHHGG it will, ONLY on the outer surface, the deep core bacteria can legit be soaked in pure chlorine for 30 minutes before it kills all bacteria.
Do not get fooled by these bs artists that tell you everything kills everything.
Also another remedial treatment you can try is get rock salts for a swimming pool, super cheap. I use 1 tablespoon per 100l, increase the salinity of the water, algea cannot grow.
I keep freshwater fish in almost salt water environment, this sounds bad, but if you slowly increase the salt, you van remove 99%of disease in your tank.
I have posted everything I use and the calcs.
I use nothing else other than prime for water change on standard dose.
I hope that helps
