Thank you both for the responses!
Brevis was what I was thinking for the more silver one. Vittatus seemed like a pretty good answer for the other two. Still can't tell if they're both the same species, they do look pretty similar.
Probably going to stick with the healthier looking ones...
Looking for help with an ID! I've read every thread and post imaginable on the difference between younger Hydrocynus species, and I'd still like some opinions.
Boss man came across some "African Goliath Tiger Fish" listed on his wholesale spread sheet ~ so he ordered a group of three. However...
82F water, very low nitrates (0-20ppm), and time. If he's eating alright, and there's no extra reason for stress, he should overcome the problem on his own given the proper conditions.
Nice pickup! Glad to hear it's from a Petco location - I do the fish ordering at our location. Always try for more of an exotic assortment than most locations; just isn't what Petco is known for.
Aquabid is a good source to browse through from time to time, otherwise check with a local fish store; used to manage one and they were available to us every now and again. Haven't seen many oddball Knives lately, but I don't remember the season for when they're most common on the market -...
Depends on the species name - plenty of Knife fish out there are being labeled as "Tiger Knifefish". Gymnotus Coatesi and Gymnotus Carapo are two of the more common species that are mistaken for a Tiger. Pictures at all? Gymnotus Carapo I'd say no, just based on the aggression of mine, however...