90l tank with community fish and snails which consist of 3 tiger barbs.7 neons.3glowlight tetras2 cherry barbs and 2 rosy barbs. i have been offered a sucking loach from a friend of mine who has 5 in his tank. he said they are good at cleaning the tank but i have read lots that they can be a disaster. what do i do whats your advice. its a real planted tank. thanks