So I have a 40 gallon long fish tank that is currently stocked with juvenile comets, but they’re at the point now that they’re bigger to head out to the pond. Which leaves me with an empty tank. This tank has two filters, one up to 40 gallon and one up to 70 gallon, so I’d say it’s pretty well filtered. I do 50% water changes once a week, occasionally twice. Im wondering what I’m looking out for stock options after the comets are removed, in regards to type, and how many. Ps I’m aware that my filter’s not supposed to be fully emerged it fell and I moved it after this picture.