I have an empty 29gallon and i want to set this up for angels i am going to order! I have a sponge filter graded for an 80gal tank and it has been seeded(placed in a mature tank for 3-4 weeks) If i just add this sponge filter will it keep it from having ammonia spikes and nitrite spikes? THe bio-load would be with the new arrivals 5 small angels thats it in a 29gal with a sponge filter rated for an 80gal!