I know next to nothing of these fish "cepting what I learned here" but I do admire your dedication to learning as much as you can to keep them thriving. My 2 cents!
If you love something, love it well
Welcome aboard
Senegal bichirs are awesome! I got my two a year ago, the captive bred one (like you have) is closing on 6" after that time. Your tank should last a while but I'd recommend a 55 for long term care.
Okay for feeding; try and skip live if possible. Pellets are they way. I also include earthworms, tilapia, frozen bloodworm or mosquito larvae and occasionally feeder insects. Live food is a health risk and puts bad habits in for feeding, as an example: A shop here recently recieved an endlicheri that had just been sitting in the suppliers tanks and chowing whatever it could. The night it was sent to the shop it bit the resident ornate to death and a week later still was refusing pellets. Please try and get pellets in as soon as you can! Polys should quickly get into the swing of things, you can also feed them after lights out
As for aquascapes, they are doable. I keep my polys in this mess:View attachment 1318322
They like having spaces to chill around the tank and are particularly fond of water sprite roots, almost like a poly hammock
Hope this helps! This poly forum is full of the most helpful people around here, enjoy your stay!
I intend for my bichir's to dominate the tank, anything else I put in it is just food for them to me. So as far as aggression goes, not something I care to discourage. I figured live food would have to be carefully monitored because it is a risk via parasites and god knows what else. The live fish I'm feeding now were born and raised in a tank I trust so its a closed circuit in my mind and relatively safe. I've planned to convert my 20 gallon into a quarantine tank of sorts so if I do buy outside live fish, I can monitor them for a period of time before offering them.
Either way, I'll be getting pellets to just to be on the intelligent side of things. It may be fun for me to do the live portion, but it's clearly not the best/safest way to go for them.
I've been ghosting around this community's forum for a bit now and I'm very pleased with what you guys have here. & I appreciate the community you all have created
Welcome to MFK! Senegals are a great specie to start off with. Definitely the most active.
Fortunate for me! I happened on this particular species by chance.