Welcome to AQ Infinicat !
Well , honestly , if you worry about overcrowding , you could get another tank , at least a larger sized one if possible . It would solve your overcrowding issue and also might have available space for new fishes too !
If you see yourself as a fishkeeper , long term wise , its better to invest in a multi level tank stand/rack . Gives you the availability to try different types of fish biotope that you may want .
Hope this helps !
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