i have just upgraded tank from a juwel rio 125 to a juwel trigon 190 i have the following fish 5 blind cave tetras 1 buinos aires tetra , 6 cardinal tetras,4 panda corys,6 pristella tetras,1 pearl gurami,1 cae i would like to have some more fish how many more could i have in the juwel 190 ? would love to have a plec but only up to about 6inches any reccomandations ?i use the juwel filter cleaning sponges in tank water weekly and doing a 20 % water change ,water stats are always fine i also have a juwel air diffuser which puts more oxygen bubbles in water thanks for any replies