So the question of how many algae eaters is too many really boils down to your specific situation...Well, now I have 25 otocinculus, 8 siamese algae eaters and like 50 shrimp, 1 pitbull pleco and 1 clown placo in a 75 gallon (amano, cherry, bee, ghost shrimp, bamboo shrimps)! heh. I just wanted you all to know that my algae is finally going away! haha! I must have something in my water that helps them or contains them, because you should see my non-planted tank! HA! You wouldn't believe it! Nor would I post an ugly photo! My snail were all eaten by my loaches... I reduced my T5 light exposure, but there is no way I can stop the outside light exposure. My houseplants need it and I dont want to use house lighting when I have these nice windows. And my cat likes to look out and I do too... They are making my aquarium look like a traffic jam situation though and making it feel cramped.