From some of Calfo’s posts my sense is that a sponge filter will suffice, but Steven Pro’s RK article (2004) suggests one may want additional water movement. Thanks. -Jeff Protein skimmer in QT? 8/6/06 Hi, Thanks in advance to the crew member who may be receiving this, I must say that I don’t know what I would do without your resource – thanks. I didn’t see anything in the archives that directly addressed this issue so here goes… I am running a quarantine tank (65 gallon) which is a bare bottomed tank with some PVC tubing, sponge filter and an Eheim Ecco canister filter for the past three months. Due to having to shift around my residence a little I have not been able to set up my main display tank properly as yet and therefore have had a Niger trigger in my quarantine for an extended stay, the fish seems fine in all ways and water changes are done regularly to keep the parameters in check. I need to keep him in the quarantine setup