pic#1 - looks like a Yamabuki Ogon(hard to tell if it's scaleless......?)
-a yellow/gold Ogon(meaning highly metallic) showing white at fin tips.
pic#2 - possible Yamabuki Hariwake or Kujaku*Hikarimoyo-mono*(hard to tell from pic - got a close up?)
- a metallic koi
pic#3 - most likely a Showa with the black on fins(got a better pic?close-up maybe?)
pic#4 - not a Tancho, more like a Kohaku
-Tancho head markings should be central on the head, body a pure white - unless it's a tancho sanke or showa. Round head marking is more traditional, but other shapes are also found. Kohaku patterns are quite simply red and white markings. Balance of the pattern over the whole body is most sought after.