I bought these catfish from the petshop. I added 5 of them to my 75 gallon aquairum that is already holding 7 yoyo loaches. What species are they? Also is it normal for them to stop swimming and spend time under drift. Resting? Sleeping? I thought 2 were gonna die (they were laying still under the driftwood) but within a few hours they were swimming around again. Any help would be a appreciated. Thanks.