Dwarf frogs

[Cowgirlmac0711]

Hi all hopefully someone can give me some helpful advice here. Im not super on top all info with having an aquarium so lost a bit. I purchased 2 african dwarf frogs in November they were very active for weeks in a one gallon tank. I moved them to a standard size tank. I clean it and it has a filter. One frog is still sorta active and the other just hid all the time and got fat. Well today I found him belly up with some fuzzy type something coming out his mouth and a reddish tint on his neck/throat area. Reason I am asking is i teach preschool and this tank is in my classroom and my kiddos found him. So looking to see why and if it is something I need to do in order to protect my other one from same fate happening, as all morning he has just hid as well. thanks in advance

 

[King Fisher]

What is a standard size tank?

Is your tank cycled?

 

[Cowgirlmac0711]

im not sure 10 or 20 gallon tank but has right size filter for it if thats what you mean as cycled?

 

[King Fisher]

Google nitrogen cycle for aquarium. If you don't know what a cycled tank is then it's not cycled. Adding fish to a tank that isn't cycled will kill fish and cause disease. At this point you would have to do a fish in cycle and because of that I would be changing out 25% of the water daily. Use a dechlorinator such as Seachem Prime when you change the water.