Carlos about said it all the frogs can cycle a tank fast they can be messy things but a good filtration system will remedy that .I use a canister filter and a under gravel for my afcs. Occasional partial water changes (1/3 every 2 months does the trick but i have a 90 gallon tank ). I gravel siphon every month . i clean my canister filter 3 or 4 times a year . i have ever had to add chemicals to my tank .