yeah they do seem a bit more active today, i've just left them alone. i never change all the water or all the filter components at the same time so there's definitely some good bacteria still. I also use aquarium salt when doing water changes. Do you think the original 2 i had left before the 4...
I have a 15 gallon tank with 6 glofish (danios) for about a year and a half.. recently things were going on and I completely neglected the tank for about a month or more. needless to say it was pretty disgusting.. So I started to clean the tank gradually each week doing about 50% water changes...