Make sure to have a couple inch gap at least for them to breach comfortably between the waters surface and the lid, I've found young bichir are easier to convert to pellets and such so I'd suggest doing that asap if your not already. Make sure the tank has some dead spots they can relax in, and if you put multiple hides in the tank that may lead to territorial aggression so no claimable areas works best in the long run. Some driftwood and rocks is fine, just don't go making caves and such.
After comparing growth rates of 2 different Senegal's I've found they grow faster on cichlid gold vs carni sinking pellet, may be because of the increased fat content of the gold vs the carni. Other then that, keep the tank at like 78-82 and you'll be fine. Young bichirs can be sensitive to nitrate buildup and become inactive, so be consistent on WCs. When larger they are tough fish, but don't let that be an excuse to not do WCs haha. A great tank mate for bichirs are leopard ctenopomas
AVOID putting plecos and algae eaters in the tank, if they get too hungry they will sometimes go after bichir slime coat and that does some damage to the bichir. Some people have luck keeping the pleco really well fed but i wouldn't advise it
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