🤨Hi. What filter can I use the suggested Seachem 50gph or less water flow. I’m having trouble controlling nitrates ina 20 gallon housing 5 small African Ciclids. I’ve purchased denitrate from Seachem, but the aqua clears I filter the tank with have much higher gph. I’ve tried all the standard remedies and am setting up a bigger tank for them, but that’s a slow happening.