I worked for a petstore that is now closing and took the 2 fire eels that were special ordered but never picked up. They were put into a 20g tank together and I fed them on frozen foods while at the LFS for 2 months. I have taken them both as a last resort and put them in a 40g with a large sponge filter and a Cascade 700 (ammonia 0, nitrite 0, nitrate 5-15, ph 7.6, temp 81.3F). One had a white splotch on his head, right in the center, that has not gotten better or worse. The other has faded blotchy areas on his face today but I haven't seen his face until now since the move (was normal during the move) and it's been a week. The only other things in the tank are a white cloud minnow and a guppy, both from quarantined tanks for a year+.
Both are eating frozen foods fine, a little jumpy in their new home still, but plenty of hiding spaces.
A) Any suggestions as to what it may be or possible treatments?
B) They have smooth small pebble substrate with caves and PVC pipes, could that be a problem? Should I switch them to fine sand?
C) Anything else as advice/suggestions?
ETA:
Both fie eels are 6-7 inches long.
Both are eating frozen foods fine, a little jumpy in their new home still, but plenty of hiding spaces.
A) Any suggestions as to what it may be or possible treatments?
B) They have smooth small pebble substrate with caves and PVC pipes, could that be a problem? Should I switch them to fine sand?
C) Anything else as advice/suggestions?
ETA:
Both fie eels are 6-7 inches long.
