https://www.americanaquariumproducts.com/Seachem.html#metronidazole*To prepare medicated fish food with flake, FD, or frozen fish food using Metronidazole; Use One Measure (2-5 gallon "in tank" dose) of Metronidazole per 15 minute fish food soaking for an average 60 gallon bio load aquarium (I use "just enough" water to mix fish food and Metronidazole).
After soak, pour entire contents into aquarium.
https://www.aquarium-medications.com/2012/07/metronidazole-by-seachem-api-more.htmlTo feed (use as for a medicated food), use 100 mg. with approximately i tablespoon of frozen or dried food (fried food would need to be placed in just a enough water to cover and make wet/moist). Feed until symptoms disappear.
Introduction of Metronidazole to the aquarium water when feeding is OK.
For sure it can be mixed with food. Over the years I have done so. However, I keep mostly smaller fish, so I pretty much just mixed it with flake food. I would put a bunch of flake into a small bowl. I would sprinkle in metro and then as a small amount of water ans stir gently. I was trying to mix multiple dosings, I would immediately feed a dose to the tank and then freeze the rrest. O cpuld then chip off a piece and drop it into the tank where it rapidly deforsted and sopred just like normal flak feeding does.
Metro tastes lousy to fish. it is important not to feed anything besides the metro infused food when dosing metro this way.
If you search via Google you will find different suggested mixes for food. Here are two I found:
This one was re SeaChem Moetroplex and was on the AmericanAqaurium Products site:
This one was from the Aquarium medications site. There is a lot of info re Metro there.
I have never kept rays, so I am not at all informed on what they will eat. However, there are a few sites where one can buy metro infused food for fish, Here is one such site https://kensfish.com/collections/medicated-food Here is another https://www.brineshrimpdirect.com/flake-diets-flake-food/medicated-brine-shrimp-flake/
And here is something which may indicate that Metro may not be around much longer as a treatment for fish FDA Warning Letter- Oct 2020
Will try to stuff in prawn first , if it does not work will tey toKeep the fish hungry. It meay spit the food out as it will not taste great. of course if rays do not chew their food ec. then it may not taste the metro. The tablet may be detected by the ray. My inclination would be to look for the powdered form and then soak the shrimp in that, you may want to try mixing in some garlic to mask the taste of the metro. I have never had any fish reject food containing garlic.
Another approach is mixing it into some Repashy gel food. Ken's fish sells metro flake. I've added the metro flake to Repashy to ensure all the fish get some and to reduce mess