Troubleshooting Slow Pepper Seedling Growth

My 3-4 week old pepper seedlings (3 hot, 1 bell) have only their original leaves, are small but green and healthy. What's wrong?

Peppers Are Naturally Slow Starters

You're doing fine—peppers are notoriously slow. Feed half-strength liquid fertilizer every 7-10 days. If indoors, harden off: place outside 7 days in protected spot (no frost, extremes), then full sun. They like 70-85°F for germination, then mid-60s for growth, then heat for fruiting. Above 90°F consistently causes blossom drop. They'll take off once acclimated to outdoor conditions.