Recently, we had to dose Praziquantel (EIHO Prazi Gold) in the 5 gallon aquarium due to suspected internal parasites.
Basically, we discovered that one or two of our Phoenix Rasboras were pale, skinny and looking sick.
Is Praziquantel Snail Safe?
We do have a variety of snails in the tank:
- 2 Horned Nerite Snails (Bumblebee snails)
- Mini Ramshorn Snails (Pest snails)
- Freshwater Limpets (not exactly snails, but similar)
We were most worried about the 2 nerite snails, since the other snails were considered pest snails that we wanted to remove anyway.
The online research results were mixed. We did web searches on API General Cure, and Hikari PraziPro, both of which contained praziquantel as the active ingredient. Most reviews said that they were safe for snails, but there were a few that mentioned that their nerite snails were affected by the treatment (either climbing out of the water, or even dying).
Since the negative reviews were in the minority, we decided to dose praziquantel in our 5 gallon tank, and monitor closely. If any signs of distress were observed, we have a separate tank to place the nerite snails.
Result after one day: No signs of distress, for nerite snails, ramshorn snails, and limpets. The horned nerite snails are still crawling about rather actively doing their thing. They did not attempt to climb out of the water.
Conclusion: Praziquantel seems to be safe for snails (including nerite snails).
EIHO Prazi Gold Review
The brand of praziquantel I used is called “EIHO Prazi Gold“. It is in liquid form, but there is quite a lot of suspended undissolved white powder in the liquid. The white powder will eventually dissolve when you put it into the aquarium. Praziquantel is notorious for being difficult to dissolve.
Overall, I think it is effective, as I can sometimes even see the dead worms that are expelled by the praziquantel. Also, the affected fish always seem to behave in a weird way, for example becoming more inactive and gasping a little (possibly the parasites are dying inside their body and causing a reaction). Other non-affected fish behave normally as usual.