Many thanks for the interest. I appreciate the comment on the garlic, it's an interesting one and wanted some different ideas I would normally never think of. I'm thinking I might be able to run some tests as well in a spare tank once the Java Fern plantlets get a decent size (got no room for them).
I haven't taken very good notes previously so just some thoughts (just thinking on which were ok with plants).
Anyways my tap water is a little salty which doesn't help but I have tried one teaspoon(?) of salt per 5 gallons on some plants (name escapes me). These didn't like it but I know of one member dosing I think this level with no issues so will try a test again. I have wondered if more established plants with roots would handle / process salt better.
Pimafix and melafix I cannot recall any issues with. Have used that quite a bit.
The dyes and acriflavin I think caused issues after several days of treatment (again I wish I had recorded this better and my tank water / conditions as I assume that may be a factor).
Furan-2 - on extended treatment - wiped out just about all plants. Maybe unlucky but not planning to try that again, hospital tank only
Triple-sulpha - can't recall any issues. Maybe plants didn't like it but recovered. Maybe??
Tetracycline, kanaplax, metro, prazi and potassium permanganate - can't recall testing (all hospital tanks). Got some pp made up (not sure if gone off) - could try testing that. Romet (sulfadimethoxine with ormetoprim) no issues but was medicated feed.