Hi steffiegirl and andigit,
Firstly excellent photography skills. They look right out of a textbook.
Have you recently added something new to the tank such as new animals, feeder fish or aquatic plants? These protozoa are normally carried through in particular feeder fish vectors. Remember to quarantine your new stock for minimum of 30 days beforehand before adding to the main tank.
Have a look at this link.
http://www.caudata.org/cc/articles/Tank_critters.shtml
This is an extract from that site. The strategies are common to reduce the protozoal load.
- Reduce feeding. Leftover food can fuel large outbreaks of tank critters.
- Remove them manually by wiping them off and/or siphoning them out. If
- Do a better job removing all uneaten food and waste products.
- Do a better job adhering to scheduled water changes (at least 10% per week, perhaps more until the critter epidemic subsides).
- Wait. In most cases, we only notice tank critters when they suddenly explode in numbers. If you wait, their number will almost always decrease as their food supply dwindles or they are balanced out by the growth of other micro-organisms in the tank.
Do NOT tear apart your whole tank and "clean everything" in order to get rid of the critters. If you do, you will need to start over with the process of cycling your tank, and you are likely to do more harm than good to your amphibians.
When i think of protozoa, i think of metronidazole. Vets can administer them in cases of parasitism on the axies themselves. Sometimes treating the axies will break the life cycle of the parasite as they do not have a source of 'nutreint' to feed from. It depends on the species of protozoa though, whether they are 100% reliant on feeding on axies, or they can survive on plant matter etc.
I cannot tell you what the other worm is, its not my area, however, im sure there will be someone here who is good at identifying aquatic protozoa. (Oceanblue im thinking you). It could be a flatworm?
Also have a look at this site.
http://www.axolotl.org/health.htm
It discusses about protozoal infections. However, i must stress do not try to self treat with over the counter medications and chemicals.
There is something i think of which might have a lot of potential in targeting the problem you are facing. It does require the correct id of the other protozoa though. An aqueous (soluble) treatment of Flubendazole is commonly used among aquarium hobbyist to get rid of a lot of parasites - hydra, planria, flatworm, snails etc. It appears to also have effect on opalina. Flubendazole has quite a high safety margin as well in that it targets specifically the biochemical pathways of parasites that axies don't have.
http://www.inkmkr.com/Fish/FlubendazoleArticle.pdf
Anyway, let me find out a bit more and get back to you about that one.
Cheers