my tanks about a month old now and has had fish in it for about 2 weeks its 120 litres contains 1 betta, 3 gold barb, 3 cherry barb, 3 bristlenose catfish and 5 assassin snails. The bristlenose catfish are newly acquired so they have started to do some damage to the algae that is on the glass and the ornaments but arent touching the algae on the plants so i just wondered if there was anything else i could do?