meadeam Posted October 30, 2022 Share Posted October 30, 2022 I started a new tank a few weeks ago. It's a 20 long in which I'll be experimenting with blackwater. I started it up with pre-cycled media including bio-rings, course sponge, fine sponge, and because I like to run air in all of my tanks regardless of filtration, an ACO nano sponge filter. The rings and sponge I loaded into a newly purchased Oase Bioplus thermo. I admit to being a sucker for clever design, and the all-in-oneness of this particular filter. Residents include 6 mid-size julli cories, and a mixed batch of a dozen neons and green neons. It had crossed my mind that a small fish could get behind the Bioplus filter, but I think I liked the design so much and wanted it to work so badly that I ignored that voice. I hadn't read any reviews that included fish getting stuck behind the filter, but I may have been unconsciously selective in my reading as well. It's been a couple weeks that the tank has been running. The cories have been glass surfing a lot as cories sometimes do in a new tank. I'd been in the habit of counting fish each time I walk past (tank is in the dining/kitchen) and this morning there weren't enough fish. I got the flashlight and started looking closer and sure enough to my horror I saw two cories trapped behind the filter. I quickly and carefully pulled the filter to release them. A trapped neon emerged as well. I cursed myself for wanting that filter to work so badly that I ignored an obvious design flaw (or the directions, as I rarely RTFM). As of now the cories are all swimming, and the neon is probably not going to make it. Each time I am sure he is dead and I approach with the net, he starts swimming again. I submerged the cursed filter in a snail tank to keep the media alive while I decide what to do. In the 20 Long I removed it from I have the nano sponge that has always been there, and a small sponge that had been running in another tank for several weeks. I know this probably isn't enough, and the tank will re-cycle. I have a cheapo HOB that I could load with the media from the from the evil fish killing bioplus while I decide what the ultimate solution is. For heat in the 20 Long (the heater left with the cursed filter) I happen to have an ACO heater I put straight in. This may mark my switch to air-driven filtration exclusively. I have ACO sponges running as secondary in every tank anyway, so I'd just add another to each, or perhaps upsize the sponges as well. Link to comment Share on other sites More sharing options...
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