Ok I will start again I was very busy before when I ask about a new filter.
I have a mature tank its running two filters the first one is the on that runs along the top in there ( From the bottom to the top ) At the bottom there it a cloth filter on top of that there are ceramic tubes then on top of them I have biosponge and on top of that there are two net's of like little stones and water comes from the tank via a power head over the top of the two net's.
The second filter is like this one
but a bit bigger. all it has in it it a biosponge.
Now both of these filters have been running for about 3months. That's when I tuck over the tank from my dad how has know time on his hands for it. Before I tuck over the tank it was a mess the water had not been changed at all not once in two years and there were three fish that were hardcore and this lived in this tank. The glass was all green and I knew I had my work cut out. I got the tank to my flat and cleaned it all up I washed the gravel and placed it back into the tank I binned all the plastic plants as there were crap (And I don't like them).
I did not know anything about media at this point and cleaned all the filter bits with very very hot water (Sorry I did not know). Then I set it all back up and got some more fish. All the new fish I got started to die one by one so I put some "METHYLENE BLUE" In to the tank. I did know water change until a month later when reading about fish keeping. I did my first water change and the three hardcore fish died.
Now my tank has been nice and clean water change once a week (20%) for over two months iv not lost a fish iv even got fry in the tank I also do weekly water test on the tank.
Now that's the past and I want more fish I have to more tanks to set up but not until I move in the new year. I have a new filter that I have put in to the tank I have running to give it a kick start. I wanted to know if it is fine to do this?
Also the filter in the tank that runs along the top are these any good?
I think I need to change some of the media as its old and has gone blue from the methylene blue I used. Can I do this?
I hope this is a bit better for you guys to read thanks.