scab

Hi. I straight away i want to say I am not great with all the measurements like pH and all. but.. Few weeks age my danio was hiding away and rocking side to side. Then, it suddenly starred swimming around with other fish and swimming around alot. However his colour went pale. The moment he got...

As title says, my male guppy has developed a black spot, and I'm not sure how or why, and possibly a second one. I'll enter all pertinent info and include pictures below: Tank size: 10g pH: 8.0 (very hard city water) ammonia: 0 nitrite: 0 nitrate: 0.12ppm kH: unknown (but I know it's full of...