My quarantine tank used to be my 10 gallon, but my betta is in there now, so I have no quarantine tank! Knowing this is a necessity, I was going to order an extra large Kritter Keeper (about 5 gallons), but read online reviews where they are prone to cracking from the weight of the water. The large Kritter Keeper, however, got good reviews. Its only a 3 gallon capacity though. I've already ordered it. Is it too small to quarantine a few (2-3) guppies for 2-3 weeks? I have one of those smallest filters that you can buy and a 50 wt. heater already for it. I neeed something with a lid, as I had two fish jump out of the Tupperware I was using for quarantine!