Angelfish are built tall and thin, with long trailing fins that catch on edges a stockier fish never touches. Decor injuries follow a pattern: a startle, a sideways bolt, and contact with a point or rough surface that should never have shared the tank. A hands-on audit of every hard surface, plus spacing that gives a bolting fish a soft landing, removes nearly all of that pattern.
Audit Every Surface With Your Hands Before It Stays
Take decor out during a water change and run clean wet hands and fingertips slowly over every face, edge, hole, and underside, in good light. Fingertips find what eyes miss: moulding burrs on resin ornaments, cracked edges on plastic plants, splinters lifting from driftwood, and chipped rims inside caves. File or sand a small burr smooth and rinse dust away thoroughly, and discard any piece that is cracked through, crumbling, or sharp in a place a file cannot reach safely. Check the inside of hollow decor as carefully as the outside, since a fish that shelters inside brushes those inner walls daily. Repeat the fingertip pass after filing, because a filed edge can still carry a ridge.
Choose and Place Hard Decor for a Tall, Fine-Finned Fish
Favour smooth river-type rock, rounded wood with no projecting splinters, and sturdy live plants as the structure of the tank. Keep lava-type rock and other abrasive stone out of an angelfish tank, since its surface acts like a rasp on fins during a sideways scrape. Space rockwork with open swimming lanes between pieces, and avoid building narrow slots that a deep-bodied angelfish can enter but cannot turn in without pressing fins against stone. Place tall planting behind and between hard pieces so a startled fish bolting from open water meets leaves before it meets rock. Anchor every stack firmly, because a shifting stone creates a new sharp edge and a trapping gap in the same movement.
Leave one open corner of the tank deliberately plain, with no hard decor at all, so the fish always has a clear resting and turning space.
Watch the Fish for the Injuries This Prevents
Check fins during feeding, when angelfish rise and spread them. Look for fresh splits along fin rays, frayed trailing edges, missing scales along the flank, and one fish suddenly shadowing itself behind plants. A clean tear in otherwise clear water usually heals as the fin regrows, so the useful response is to find and remove the edge that caused it, then keep the water clean and stable while you watch. A wound that deepens, flesh that looks eaten away, or a fish that stops eating, clamps its fins, or breathes fast can point to problems such as infection or water trouble that an aquatic vet should investigate promptly. Photographing a tear on the day you spot it gives you a comparison for healing over the following week.
Recheck After Every Change, Not Just at Setup
New risk enters a tank one purchase or rearrangement at a time, so the audit repeats whenever decor changes. Quarantine new ornaments on the worktop for a fingertip pass before they touch water, and repeat the pass in place after rearranging rock, since turning a smooth piece can expose the rough face that sat against the glass. Keep a simple rule for the household: whoever changes the layout owns the recheck. Scheduling that recheck, plus a weekly fin glance at feeding time, in KinsLe through Care Teams turns a one-off tidy into a standing habit that follows the tank.