HOPE THIS HELPS
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the inside of my tank is not as nice as it could be if i dident have these deatructiv fish but the best thing i did was add a hydroponics atachment to the tank i just pump my water into a rain gutter but the effects of having the plants in there has ben grate i have no ammonia spikes ever. this type of thing could realy help a carnivorus fish tank like a paranas tank . good luck...