If you add TREX/LREX with clen, you'll definitely have a potent stack however, be careful, as your blood pressure will be flying through the roof. So keep an eye out for that. Also, make sure you drink plenty of water as the addition of TREX with clen will intensify any headaches or dizziness you may encounter. If you do combine both, keep your clen dosage low. You'll be better off combining LREX with clen as it's a non-stimulant...
You might be better doing clen (t3 if accesible) for a cycle and take TREX/LREX for two weeks afterwards
I cannot stress how important water is!