Hi I am wondering how many loaches I should have in my tank. I would like to add 2 zebra loaches? My bottom fish are 3 clowns, 3 yoyos, 2 cory's, 1 bristlenose plec. I would also like to get 2 polkadot loaches? Am I pushing it or will all these guys live happily togother? 75 gal 48"l lots of wood and java plants.