Yes, it’s kind of normal to have algae in some form in most aquariums.
Trick is to keep it under control by ensuring water parameters are good, no overfeeding livestock, if you dose ferts, make sure you dose according to dosage on instructions, timing of light kept to reasonable lengths (usually 7-8 hours daily is the norm in UK), keep direct sunlight off the tank as well and weekly maintenance to clean off algae off surfaces of glass and prefilter sponges etc.
All of those will help keep algae under control to a certain extent.