http://forum.aqua-fish.net/ A forum devoted to aquarium fish, plants, techniques and fish keeping as a whole. en http://forum.aqua-fish.net/?topic=hi-all-one-serious-problem#1 i am new here. I have a new tank (17"x17"x 17") with no plantation as of now (planning to add soon). Currently I have 8 variety of fishes (total 12 fishes) in it, all small size: 1) Bushymouth catfish - 01 (size 2") 2) Green phantom pleco -01 (No more as on date, some other fish ate it) (Size 1.5-2") 3) Honey gourami - 01 (Size 3.2") 4) Koi carp - 03 (1 white, 2 dual coloured) (Size 3.5") 5) Shark catfish -03 (1 white, 2 gray coloured), (Size 3-4") 6) Goldfish - 01 (Size 3.5") 7) Short finned molly -01 (size 1.5") 8) Rosy barb -02 (size 1.5") There is a strange thing that every morning i wake up i see 1 small fish missing. Today morning i could NOT find "Green phantom pleco". I want to find who is eating the smaller fishes. Earlier i had some small red colour fishes (Size 0.5- 1"), all of them are eaten in the night one-by-one and yesterday even "Green phantom pleco" was eaten. I would like to isoate the eater of these small fishes. Till this time i never had any issues. only after addition of these fishes i see the smaller fishes gone in the night: Honey gourami-01 White Shark catfish -01 Goldfish - 01 Rosy barb -02 So could you please help and suggest who would be eater of small fishes. job777 2013-01-09 http://forum.aqua-fish.net/?topic=hi-all-one-serious-problem#2 Im guessing the catfish - the barbs will like your gourami's fins as a snack when they are bored. First solution: get plants. Your fish need them to hide and escape from others. Since fish have a memory of about 4 seconds; if the "target" can escape from view for 2 seconds or more it has a good chance of attention being diverted. Try youtube for "aqua-scaping". Also, try to give them "stuff" to do...don't feed every day, not at the same time..challenge them some (but don't be cruel or impossible). cheers, Madm 2013-02-07 http://forum.aqua-fish.net/?topic=hi-all-one-serious-problem#3 btw...whats your logic in putting cold water fish in the same tank as tropical fish? ...Nature knows best, so try to mimick that. Madm 2013-02-07