Based on web recommendations, I turned the heat up in the tank last night and they actually seem a little better, though i'd be shocked if that could make a difference in so little time.
The two sickish fish are 1 German Ram and 1 Honey Dwarf Gourami. Also in the tank are 5 Rainbows, 12 cardinal tetras, 2 other dwarf gouramis, 3 Ottos, 3 Cory Cat and 1 Pl*co. 30 Gal
. tank, lots of plants, ammonia and nitrite at 0, nitrate around 5 and phosphate around .25, ph 7.0. Sparklingly clean water, as I just ran my diatom filter last Friday.
Neither fish seems to be on death's door and I would also like advice about how long I can wait to treat, hoping they will heal themselves, or whether I should treat immediately. Also, I suppose running the diatom filter may have actually helped to remove some of the parasites, right. That's not at all why I ran it, but that would be serendipitous if it lessened my parasite troubles.