like it states. i previously had tank setup with course gravel with a clown knife, oscar, texas chichlid, and pleco. for filtration i was running two maxi-jet 1200 powerheads, one in each rear corner. the two rear corners were sectioned off to create a triangle basically which ran approx. 4 inches from the front glass to approx 12" in rear with corner creating right angle if that makes sense. the triangle was sectioned into two halves. the rear half had holes on top which water ran through then down through bonded filter. remainder of that section was filled with bio-balls. it then went throught the bottom seperator holes where it was pumped back out the top. i'm sure i lost most of you. anyhow, i'm now planning on running a canister setup. ive heard either eheim 2217 or fluval fx5. which would be best for me? i'm only planning on stocking another clown knife and a bichir. which brings up next question. does sand give any benefit at all? eg. reduce harardous levels. only reason to even use a substrate would be to use artificial plants to create hiding spots. any info is appreciated. i'm from the old undergravel and go world, so any tips help. thanks.

