You can add as many as you want. If you're not crazy about them as inverts, then add just a few. If you're nuts about them like me, add a bunch of them. I've had has many as 100 in my 75g at a time. It's amazing to have them all over the tank!
And don't worry about running out of algae. They eat fish food just fine. In fact, they're a ton of fun to watch the different ways they go about getting the food. Just never drop an algae wafer in the tank. One amano can pick up the whole wafer and carry it off! LOL!
Vicki Rena Filstar pimp #142 (four XP4s/three XP2s/one XP1) Eheim pimp #301 (Pro II 2128) Victor pimp #27 (VTS-253B-320)
90g - Journal
Pelvicachromis taeniatus 'Moliwe'
75g - Journal
Pelvicachromis pulcher 'Lagos Red' Better Pics 8-24
29g - Journal
Pelvicachromis pulcher 'unknown' --
29g - Pelvicachromis taeniatus 'Moliwe'
5g - RCS colony
2.5g - Journal