Hi, i was wondering as to wether my filter a marina S15 with extra filter wool in the back be able to handle 7 neon tetras , 2 gouramis & and a brissle nose plec as before I setup for tropical I had 4 shubunkins in the 60l tank 60cm x 30cm x 35cm and the filter was cycled in a month with 4 messy goldfish, our should I buy something like a fluval u1, just cause I dont really want anything else in my tank taking up space and just wondering wether the current filter will be okay? atm i only have the 7 neons is so any help would be great thanks.
Sorry don't know anything about the marina s15 but a quick google says it does up to 57l tank so more suitable then the fluval u1 which only does up to 45l which would be too small for your 60l tank.
When you say the filter cycled in a month did you check the water parameters to check this? I would say that if in fact the marina handled 4 messy fish like you had then the ones you are proposing should not be a problem. But I don't know much about them, someone else will be able to better advise.
Personally I like fluval, so if you are going to change you will need to go for the U2 for your tank and go through maturing the filter media again (I'm having to do this at the moment with a U3) Just need to run both filters along side.