I swear that the tank I'm refering to does just fine when left completely ALONE!!! It's only when I mess with it that issues appear.

My husband has even been known to toss in 3-4 gallons of completely UNTREATED water (to quiet the noise from the filter outflow due to evaporation), with NO adverse effects! (Well, none other than a slightly higher water hardness level, and a stern lecture from moi.)

Even our beloved Miskairal recently decided that she over does the cleaning and vacuuming, and cut back on her diligent schedule.

Her fish seem to be fairing much better now, and her ego will follow soon, I am sure.

I stopped the Maracyn cure, and once the cloudiness started to dissipate, I think, <knock wood> that the gups are fairing a bit better.

I've noticed that the clown loaches have eaten any and all remaining snails in that tank, however, so I think my next "treatment" will be to add some from my fry tank upstairs.

Call me nuts, but that is the only variable in the equation that has changed over the past few months.  

Well there is plenty of algae on all the PLASTIC
plants in there to support a nice sized snail colony.  

I'm going to hold off on any further medication and see what happens.  

I don't want to Whack my biological filter by adding meds, and lose my beloved Clown Loaches over two old crotchity male gups.

I mean seriously, don't you think you'd shake a bit if you were over one hundred? :-P

Keep me posted, and I'll do the same.