Hello, looking for some advice please from you guys, my first post. I have recently stripped down a Juwel Rio 300 litre, kept malawi but changing over to South Americans. The tank has a "Back To Nature Background" and after 4 years it needed a good clean out behind it. It was running a Fluval 405 and 205, I have hooked these two up to a smaller tank for around a week housing 10 small corys and a tiger plec. I have the oppotunity to get a good selection of fish, 6 dollars, 2 keyhole, 1 sev and around 15 mixed tetra. My question is, on refilling the tank and hooking the filters up, will that amount of fish overload the filters and cause a crash or will the filters still have good levels of bacteria to cope with the new fish? Any advice would be much appreciated. Thank you.