dwarf sucker

Hi all, I am a beginner fish keeper. I like otocinclus and shrimps. otocinclus fish is expensive in our place. one day as a co incident we happened to notice a lot of catfishes near a small waterfall while having leisure time with my family. please find attached pics and help me to identify...

I am going to start a new 30 gallon tall fresh water mostly planted tank. I'm planning on fishless cycling once i get my soil and plants in. My stocking ideas are 2 Angelfish, 4 Black Neon Tetra, 5 Cherry Barbs, and 3 Dwarf Sucker fish. I chose those tetras because they are bigger than the...