hi rachel, >Hypoptoma, and also Microlepidogaster, are also good fish for the planted >tank, but like otos they stay pretty small - 2". Hypoptoma are much larger fish than Otos. i've seen them close to 3", which is double the size of Otos, Paroto's and Micro's. now if i could just keep them alive... i've never had them survive long. have you kept them? -- tsuh yang CHEN in nyc