I have matrix by seachem and I sponge filter I hope that’s okay I def took out the carbon I just get worried about ammonia and the box fish I don’t want him to get stressed because my worst fear about him is getting stressed and killing everything but they have been eating sea weed so I hope they aren’t supper stressed I love my box fish he’s so awesome!Yes. Pleas get a copper test kit. The one that tests your copper. Ammonia testing is important. Please do not put anything porous is the hospital tank as it will absorb and lower copper concentration. Copper must be effective at all times during therapy or the clock restarts. There must be no fish in display left for 74 days. Tank and hospital tank should be more than 10 ft apart. If display water makes into hospital tank the clock on the hospital tank restarts. Good luck. Thanks for trusting the big boys (no I am not one of those big boys).