I feel much more guilty about a fish escaping than other unavoidable deaths. I had my tank sealed up pretty tight tho, and my tiretrack still managed to escape.
I was afraid of that, too. Turns out that even a small HOB or some surface movement in a sump is plenty because it is always happening. CO2 doesn't have time to accumulate in any significant amount. My 55g is somewhat tightly sealed but has two HOB's. The plastic trim is cut to pretty much touch the waterfalls and nothing wider than 1/4" would be able to get out. All is well.Probably not too good for air exchange if your tank is sealed up too tight. There has to be some gaps or your fish would suffocate.
knifegill;4309819; said:I was afraid of that, too. Turns out that even a small HOB or some surface movement in a sump is plenty because it is always happening. CO2 doesn't have time to accumulate in any significant amount. My 55g is somewhat tightly sealed but has two HOB's. The plastic trim is cut to pretty much touch the waterfalls and nothing wider than 1/4" would be able to get out. All is well.
That's pretty much what my tanks look like, but with glass lids and those plastic trim pieces. I am also a chronic understocker. You can always try it tighter and watch your fish closely. They'll shoot for the surface to breathe if it goes bad you'll have time to correct it.So it's OK to essentially saranwrap your tank except for the tiny gaps where a HOB filter or two are located? I was always to scared to make it super tight.