I recently bought 2 yasha gobies from ocean treasure. I didn't see one for 2 weeks, then today I saw him. Now both Yasha gobies are always together. They're still moving around but now they kinda seemed to pair. Is this normal with Yashas? Or did I get lucky and get a male & female? I hope they say healthy I've heard they are alittle hard to keep feed properly in a large tank. Anyone have experience with them?