hey i am new to this but i have a 4ft tank set up in my room as my brother brought a 6ft one. i have no filters but a aqua one 400l/h and a eheim filter that i dont know about. the eheim was brought when a sea horse farm sold up in my town and we brought some equipment and the tank. could aanyone help me out with what filtration would be good?? i know a canister would be exellent any suggestions???