You can use the knitting mesh that are found in most craft stores, I use it on my pumps in the sump as the eel travels through compartments and this way he won't be sucked in. Hope this helps!!
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Always looking for the next best coral...
90g starphire cube/400mhRadium20k/2 XHO/2x27w UV/2x39w T5/ 3 Trulumen led strips
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