Freshwater angelfish

1) Where they come from

Freshwater angelfish (Pterophyllum scalare) come from the Amazon basin—slow, warm waters with tangled roots, leaf litter, and plants. That tall, flat body isn’t just for looks; it’s made for slipping through vertical stems and branches.

2) Setting up their tank

Give them height. A tall tank looks like a “nice-to-have,” but it makes a real difference once they’re adult and those fins get long. They also appreciate calm water—blasting them with flow tends to stress them out over time.

• Tank size: I’d start with 30 gallons for a small group of juveniles, but 40+ makes life easier (and reduces drama). For a pair, 29–40 works well depending on tank shape.
• Tank shape: taller is better than long-and-shallow. Think “display tank,” not “river raceway.”
• Temp: 78–82°F (25.5–28°C). Cooler water can work short-term, but they color up and eat better warm.
• pH/hardness: they’re flexible if you keep it stable. Mine have done fine around neutral with moderate hardness.
• Filtration: steady, not raging. Sponge filters are great for pairs/breeding tanks; canisters/HOBs are fine if you baffle the output.

Decor-wise, you’ll get the best behavior if you break up line-of-sight. Driftwood, tall plants (real or fake), and a few “walls” of hardscape give shy fish somewhere to tuck in and give a bullied fish an exit route.

3) What to feed them

Angels are easy to feed, but they do best with variety. A good staple pellet/flakes plus frozen foods will keep them growing evenly and looking sharp.

• Staple: quality cichlid/angelfish pellets (small enough to swallow without chewing forever).
• Frozen: bloodworms, brine shrimp, mysis—rotate them instead of picking one and repeating it forever.
• Occasional: live foods if you have a clean source (great for conditioning breeders).
• Veggie matter: not their main thing, but a bit of spirulina-based food won’t hurt and helps some fish keep weight.

4) Behavior and tankmates

They’re cichlids with good manners… until they’re not. Most of the time they’re calm, curious, and kind of “pet-like.” But once a pair forms, they can flip into bouncer mode and start policing the whole tank.

• Good tankmates: larger tetras (like rummynose, bleeding heart), peaceful rainbowfish, Corydoras, bristlenose plecos, many peaceful loaches.
• Use caution: gouramis (sometimes fine, sometimes a staring contest), dwarf cichlids (territory overlap), slow fancy fish that get bullied.
• Avoid: fin-nippers (serpae tetras, many barbs), aggressive cichlids, and tiny fish that fit in an adult angel’s mouth.

That last point catches people off guard. Your angels may ignore small fish for months… and then one day they decide a neon tetra is a snack. If it can fit, assume it’s on the menu eventually.

5) Breeding tips (if you want to go down that rabbit hole)

Angels are one of those fish that make you feel like a proud grandparent the first time you see them cleaning a leaf together. They lay eggs on vertical surfaces—broad plant leaves, driftwood, the filter intake… whatever looks right to them.

• Best way to get a pair: buy 5–8 juveniles and let them pair off naturally.
• Give them a spawning surface: a tall leaf, slate tile, or a spawning cone works great.
• Conditioning: warm water + heavy feeding (quality foods, frozen/live) = more consistent spawns.
• If you want to raise fry: a separate tank makes it way less stressful than trying to do it in a busy community.

6) Common problems to watch for

Angels are pretty hardy once settled, but they’re not forgiving of filthy water or constant stress. Most “mystery issues” I’ve dealt with came down to bullying, temperature swings, or long-term nitrate creep.

• Fin damage: usually from nipping or rough decor. Fix the tankmates/scape first, then the fins usually grow back.
• Ich and other parasites: angels show it clearly (white spots, flashing, clamped fins). Warmer temps speed up parasite life cycles, so treat promptly and follow through.
• Hole-in-the-head/erosion (less common, but real): often linked to long-term water issues and diet variety. Clean water and better food usually help a lot.
• Bloat/constipation: often from overfeeding rich foods or dry foods. Fast for a day, then offer lighter foods (like brine shrimp) and adjust feeding habits.
• Sudden aggression: often a pair formed. Expect them to claim a corner and start evicting neighbors.